<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 4.9a -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: http://www.novaworks.co -->
    <!-- Field: Doc-Info; Name: Source; Value: 10.xfr; Date: 2015%2D09%2D17T19:06:40Z -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef roleURI="http://pro-dex.com/role/DocumentAndEntityInformation" xlink:href="pdex-20150630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/ConsolidatedBalanceSheets" xlink:href="pdex-20150630.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="pdex-20150630.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:href="pdex-20150630.xsd#ConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:href="pdex-20150630.xsd#ConsolidatedStatementsOfShareholdersEquity" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="pdex-20150630.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/DescriptionOfBusiness" xlink:href="pdex-20150630.xsd#DescriptionOfBusiness" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="pdex-20150630.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/BusinessAcquisitions" xlink:href="pdex-20150630.xsd#BusinessAcquisitions" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItems" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItems" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/WarrantyAccrual" xlink:href="pdex-20150630.xsd#WarrantyAccrual" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxes" xlink:href="pdex-20150630.xsd#IncomeTaxes" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSale" xlink:href="pdex-20150630.xsd#DiscontinuedOperationsAndRealEstateHeldForSale" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderations" xlink:href="pdex-20150630.xsd#InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderations" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommitmentsAndContingencies" xlink:href="pdex-20150630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensation" xlink:href="pdex-20150630.xsd#Share-basedCompensation" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/MajorCustomersSuppliers" xlink:href="pdex-20150630.xsd#MajorCustomersSuppliers" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/LossPerShare" xlink:href="pdex-20150630.xsd#LossPerShare" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommonStock" xlink:href="pdex-20150630.xsd#CommonStock" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SegmentInformation" xlink:href="pdex-20150630.xsd#SegmentInformation" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SubsequentEvents" xlink:href="pdex-20150630.xsd#SubsequentEvents" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="pdex-20150630.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/BusinessAcquisitionsTables" xlink:href="pdex-20150630.xsd#BusinessAcquisitionsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsTables" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/WarrantyAccrualTables" xlink:href="pdex-20150630.xsd#WarrantyAccrualTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesTables" xlink:href="pdex-20150630.xsd#IncomeTaxesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleTables" xlink:href="pdex-20150630.xsd#DiscontinuedOperationsAndRealEstateHeldForSaleTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommitmentsAndContingenciesTables" xlink:href="pdex-20150630.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensationTables" xlink:href="pdex-20150630.xsd#Share-basedCompensationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/LossPerShareTables" xlink:href="pdex-20150630.xsd#LossPerShareTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SegmentInformationTables" xlink:href="pdex-20150630.xsd#SegmentInformationTables" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:href="pdex-20150630.xsd#SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/BusinessAcquisitionsDetails" xlink:href="pdex-20150630.xsd#BusinessAcquisitionsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/BusinessAcquisitionsDetailsNarrative" xlink:href="pdex-20150630.xsd#BusinessAcquisitionsDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/BusinessAcquisitionsDetailsNarrative1" xlink:href="pdex-20150630.xsd#BusinessAcquisitionsDetailsNarrative1" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails2" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails3" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails3" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails4" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails4" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails5" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails5" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails6" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetails6" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetailsNarrative" xlink:href="pdex-20150630.xsd#CompositionOfCertainFinancialStatementItemsDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/WarrantyAccrualDetails" xlink:href="pdex-20150630.xsd#WarrantyAccrualDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/WarrantyAccrualDetailsNarrative" xlink:href="pdex-20150630.xsd#WarrantyAccrualDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails2" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails3" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails3" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails4" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails4" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails5" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails5" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetails6" xlink:href="pdex-20150630.xsd#IncomeTaxesDetails6" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/IncomeTaxesDetailsNarrative" xlink:href="pdex-20150630.xsd#IncomeTaxesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleDetails" xlink:href="pdex-20150630.xsd#DiscontinuedOperationsAndRealEstateHeldForSaleDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleDetailsNarrative" xlink:href="pdex-20150630.xsd#DiscontinuedOperationsAndRealEstateHeldForSaleDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderationsDetailsNarrative" xlink:href="pdex-20150630.xsd#InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderationsDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommitmentsAndContingenciesDetails" xlink:href="pdex-20150630.xsd#CommitmentsAndContingenciesDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:href="pdex-20150630.xsd#CommitmentsAndContingenciesDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensationDetails" xlink:href="pdex-20150630.xsd#Share-basedCompensationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensationDetails1" xlink:href="pdex-20150630.xsd#Share-basedCompensationDetails1" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensationDetails2" xlink:href="pdex-20150630.xsd#Share-basedCompensationDetails2" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/Share-basedCompensationDetailsNarrative" xlink:href="pdex-20150630.xsd#Share-basedCompensationDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/MajorCustomersSuppliersDetailsNarrative" xlink:href="pdex-20150630.xsd#MajorCustomersSuppliersDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/LossPerShareDetails" xlink:href="pdex-20150630.xsd#LossPerShareDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/LossPerShareDetailsNarrative" xlink:href="pdex-20150630.xsd#LossPerShareDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/CommonStockDetailsNarrative" xlink:href="pdex-20150630.xsd#CommonStockDetailsNarrative" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SegmentInformationDetails" xlink:href="pdex-20150630.xsd#SegmentInformationDetails" xlink:type="simple" />
    <link:roleRef roleURI="http://pro-dex.com/role/SubsequentEventsDetailsNarrative" xlink:href="pdex-20150630.xsd#SubsequentEventsDetailsNarrative" xlink:type="simple" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DocumentAndEntityInformation" xlink:title="00000001 - Document - Document and Entity Information" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/ConsolidatedBalanceSheets" xlink:title="00000002 - Statement - CONSOLIDATED BALANCE SHEETS">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaapAssetsCurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaapAccountsReceivableNetCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapAccountsReceivableNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnbilledReceivablesCurrent" xlink:label="loc_us-gaapUnbilledReceivablesCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapUnbilledReceivablesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaapOtherReceivablesNetCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapOtherReceivablesNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaapInventoryNet" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapInventoryNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaapPrepaidExpenseCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapPrepaidExpenseCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaapDeferredTaxAssetsNetCurrent" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssetsCurrent" xlink:to="loc_us-gaapDeferredTaxAssetsNetCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaapAssets" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapAssetsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketableSecuritiesNoncurrent" xlink:label="loc_us-gaapMarketableSecuritiesNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapMarketableSecuritiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapIntangibleAssetsNetExcludingGoodwill" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaapOtherAssetsNoncurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapOtherAssetsNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_InvestmentAndRelatedNotesReceivableNonCurrent" xlink:label="loc_pdexInvestmentAndRelatedNotesReceivableNonCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_pdexInvestmentAndRelatedNotesReceivableNonCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaapGoodwill" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAssets" xlink:to="loc_us-gaapGoodwill" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaapLiabilitiesCurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaapAccountsPayableCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccountsPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaapAccruedLiabilitiesCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccruedLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaapDeferredRevenueCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapDeferredRevenueCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaapAccruedIncomeTaxesCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapAccruedIncomeTaxesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeaseObligationsCurrent" xlink:label="loc_us-gaapCapitalLeaseObligationsCurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapCapitalLeaseObligationsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NotesPayableCurrent" xlink:label="loc_us-gaapNotesPayableCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesCurrent" xlink:to="loc_us-gaapNotesPayableCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesNoncurrent" xlink:label="loc_us-gaapLiabilitiesNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaapDeferredTaxLiabilitiesNoncurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapDeferredTaxLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRentCreditNoncurrent" xlink:label="loc_us-gaapDeferredRentCreditNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapDeferredRentCreditNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CapitalLeaseObligationsNoncurrent" xlink:label="loc_us-gaapCapitalLeaseObligationsNoncurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapCapitalLeaseObligationsNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermNotesPayable" xlink:label="loc_us-gaapLongTermNotesPayable" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesNoncurrent" xlink:to="loc_us-gaapLongTermNotesPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilities" xlink:to="loc_us-gaapLiabilitiesNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapCommonStockValue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapStockholdersEquity" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaapLiabilitiesAndStockholdersEquity" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapLiabilities" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapLiabilitiesAndStockholdersEquity" xlink:to="loc_us-gaapStockholdersEquity" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:title="00000003 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveLoss" xlink:title="00000004 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaapGrossProfit" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaapSalesRevenueNet" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapGrossProfit" xlink:to="loc_us-gaapSalesRevenueNet" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaapCostOfRevenue" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapGrossProfit" xlink:to="loc_us-gaapCostOfRevenue" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaapOperatingExpenses" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingExpense" xlink:label="loc_us-gaapSellingExpense" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapSellingExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaapGeneralAndAdministrativeExpense" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapGeneralAndAdministrativeExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaapResearchAndDevelopmentExpense" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingExpenses" xlink:to="loc_us-gaapResearchAndDevelopmentExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaapOperatingIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingIncomeLoss" xlink:to="loc_us-gaapGrossProfit" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingIncomeLoss" xlink:to="loc_us-gaapOperatingExpenses" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaapNonoperatingIncomeExpense" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaapInterestExpense" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNonoperatingIncomeExpense" xlink:to="loc_us-gaapInterestExpense" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaapInvestmentIncomeInterest" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNonoperatingIncomeExpense" xlink:to="loc_us-gaapInvestmentIncomeInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketableSecuritiesRealizedGainLoss" xlink:label="loc_us-gaapMarketableSecuritiesRealizedGainLoss" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNonoperatingIncomeExpense" xlink:to="loc_us-gaapMarketableSecuritiesRealizedGainLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1" xlink:label="loc_us-gaapGainLossOnDispositionOfAssets1" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNonoperatingIncomeExpense" xlink:to="loc_us-gaapGainLossOnDispositionOfAssets1" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="loc_us-gaapOperatingIncomeLoss" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="loc_us-gaapNonoperatingIncomeExpense" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaapIncomeLossFromContinuingOperations" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperations" xlink:to="loc_us-gaapIncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeLossFromContinuingOperations" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapIncomeLossFromContinuingOperations" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaapIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetIncomeLoss" xlink:to="loc_us-gaapIncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapNetIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapOtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="loc_us-gaapOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/ConsolidatedStatementsOfShareholdersEquity" xlink:title="00000005 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/ConsolidatedStatementsOfCashFlows" xlink:title="00000006 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapNetIncomeLoss" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaapDepreciationDepletionAndAmortization" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapDepreciationDepletionAndAmortization" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainOnSaleOfInvestments" xlink:label="loc_us-gaapGainOnSaleOfInvestments" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapGainOnSaleOfInvestments" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_GainOnSaleOfRealEstateHeldForSale" xlink:label="loc_pdexGainOnSaleOfRealEstateHeldForSale" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_pdexGainOnSaleOfRealEstateHeldForSale" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaapGainLossOnSaleOfPropertyPlantEquipment" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapGainLossOnSaleOfPropertyPlantEquipment" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaapShareBasedCompensation" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapShareBasedCompensation" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaapProvisionForDoubtfulAccounts" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapProvisionForDoubtfulAccounts" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaapIncreaseDecreaseInAccountsReceivable" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInAccountsReceivable" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInUnbilledReceivables" xlink:label="loc_us-gaapIncreaseDecreaseInUnbilledReceivables" />
      <link:calculationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInUnbilledReceivables" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaapIncreaseDecreaseInInventories" />
      <link:calculationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInInventories" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" />
      <link:calculationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_IncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndDeferredRent" xlink:label="loc_pdexIncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndDeferredRent" />
      <link:calculationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_pdexIncreaseDecreaseInAccountsPayableAndAccruedLiabilitiesAndDeferredRent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaapIncreaseDecreaseInDeferredRevenue" />
      <link:calculationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInDeferredRevenue" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:label="loc_us-gaapIncreaseDecreaseInAccruedIncomeTaxesPayable" />
      <link:calculationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:to="loc_us-gaapIncreaseDecreaseInAccruedIncomeTaxesPayable" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaapPaymentsToAcquireProductiveAssets" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsToAcquireProductiveAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment" xlink:label="loc_us-gaapProceedsFromSaleOfRealEstateHeldforinvestment" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapProceedsFromSaleOfRealEstateHeldforinvestment" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaapPaymentsToAcquireBusinessesNetOfCashAcquired" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsToAcquireBusinessesNetOfCashAcquired" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireNotesReceivable" xlink:label="loc_us-gaapPaymentsToAcquireNotesReceivable" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsToAcquireNotesReceivable" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaapProceedsFromSaleOfPropertyPlantAndEquipment" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapProceedsFromSaleOfPropertyPlantAndEquipment" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaapProceedsFromIssuanceOfCommonStock" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapProceedsFromIssuanceOfCommonStock" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaapPaymentsToAcquireIntangibleAssets" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsToAcquireIntangibleAssets" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="loc_us-gaapPaymentsToAcquireInvestments" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsToAcquireInvestments" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_PrincipalPaymentsOnCapitalLeaseRepaymentsOfNotePayable" xlink:label="loc_pdexPrincipalPaymentsOnCapitalLeaseRepaymentsOfNotePayable" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="loc_pdexPrincipalPaymentsOnCapitalLeaseRepaymentsOfNotePayable" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaapPaymentsForRepurchaseOfCommonStock" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="loc_us-gaapPaymentsForRepurchaseOfCommonStock" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_NetProceedsReceivedPaidRelatedToCommonStockRightsOffering" xlink:label="loc_pdexNetProceedsReceivedPaidRelatedToCommonStockRightsOffering" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="loc_pdexNetProceedsReceivedPaidRelatedToCommonStockRightsOffering" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_ProceedsFromPaymentsStockOptionsExercised" xlink:label="loc_pdexProceedsFromPaymentsStockOptionsExercised" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:to="loc_pdexProceedsFromPaymentsStockOptionsExercised" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaapCashAndCashEquivalentsPeriodIncreaseDecrease" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_us-gaapNetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:type="arc" weight="1" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_us-gaapNetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:type="arc" weight="1" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapCashAndCashEquivalentsPeriodIncreaseDecrease" xlink:to="loc_us-gaapNetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DescriptionOfBusiness" xlink:title="00000007 - Disclosure - Description of Business" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="00000008 - Disclosure - Summary of Significant Accounting Policies" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/BusinessAcquisitions" xlink:title="00000009 - Disclosure - Business Acquisitions" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItems" xlink:title="00000010 - Disclosure - Composition of Certain Financial Statement Items" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/WarrantyAccrual" xlink:title="00000011 - Disclosure - Warranty Accrual" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxes" xlink:title="00000012 - Disclosure - Income Taxes" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSale" xlink:title="00000013 - Disclosure - Discontinued Operations and Real Estate Held for Sale" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderations" xlink:title="00000014 - Disclosure - Investment in Ramsey Property and Related Notes Receivable &amp; Variable Interest Entity Considerations" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommitmentsAndContingencies" xlink:title="00000015 - Disclosure - Commitments and Contingencies" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensation" xlink:title="00000016 - Disclosure - Share-Based Compensation" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/MajorCustomersSuppliers" xlink:title="00000017 - Disclosure - Major Customers &amp; Suppliers" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/LossPerShare" xlink:title="00000018 - Disclosure - Loss Per Share" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommonStock" xlink:title="00000019 - Disclosure - Common Stock" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SegmentInformation" xlink:title="00000020 - Disclosure - Segment Information" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SubsequentEvents" xlink:title="00000021 - Disclosure - Subsequent Events" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:title="00000022 - Disclosure - Summary of Significant Accounting Policies (Policies)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/BusinessAcquisitionsTables" xlink:title="00000023 - Disclosure - Business Acquisitions (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsTables" xlink:title="00000024 - Disclosure - Composition of Certain Financial Statement Items (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/WarrantyAccrualTables" xlink:title="00000025 - Disclosure - Warranty Accrual (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesTables" xlink:title="00000026 - Disclosure - Income Taxes (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleTables" xlink:title="00000027 - Disclosure - Discontinued Operations and Real Estate Held for Sale (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommitmentsAndContingenciesTables" xlink:title="00000028 - Disclosure - Commitments and Contingencies (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensationTables" xlink:title="00000029 - Disclosure - Share-Based Compensation (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/LossPerShareTables" xlink:title="00000030 - Disclosure - Loss Per Share (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SegmentInformationTables" xlink:title="00000031 - Disclosure - Segment Information (Tables)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:title="00000032 - Disclosure - Summary of Significant Accounting Policies (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/BusinessAcquisitionsDetails" xlink:title="00000033 - Disclosure - Business Acquisitions (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesPromissoryNotePayableToSeller" xlink:label="loc_pdexBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesPromissoryNotePayableToSeller" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:to="loc_pdexBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesPromissoryNotePayableToSeller" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/BusinessAcquisitionsDetailsNarrative" xlink:title="00000034 - Disclosure - Business Acquisitions (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/BusinessAcquisitionsDetailsNarrative1" xlink:title="00000035 - Disclosure - Business Acquisitions (Details Narrative 1)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails" xlink:title="00000036 - Disclosure - Composition of Certain Financial Statement Items (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaapInventoryNet" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryRawMaterials" xlink:label="loc_us-gaapInventoryRawMaterials" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_us-gaapInventoryRawMaterials" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaapInventoryWorkInProcess" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_us-gaapInventoryWorkInProcess" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_InventorySubAssemblies" xlink:label="loc_pdexInventorySubAssemblies" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_pdexInventorySubAssemblies" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaapInventoryFinishedGoods" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapInventoryNet" xlink:to="loc_us-gaapInventoryFinishedGoods" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails2" xlink:title="00000037 - Disclosure - Composition of Certain Financial Statement Items (Details 2)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaapPropertyPlantAndEquipmentNet" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaapPropertyPlantAndEquipmentGross" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:to="loc_us-gaapPropertyPlantAndEquipmentGross" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapPropertyPlantAndEquipmentNet" xlink:to="loc_us-gaapAccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails3" xlink:title="00000038 - Disclosure - Composition of Certain Financial Statement Items (Details 3)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsNet" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsGross" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsNet" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsGross" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsNet" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails4" xlink:title="00000039 - Disclosure - Composition of Certain Financial Statement Items (Details 4)">
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_FiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:label="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearThree" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFour" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFive" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexFiniteLivedIntangibleAssetsExpectedAccumulatedAmortization" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails5" xlink:title="00000040 - Disclosure - Composition of Certain Financial Statement Items (Details 5)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaapAccruedLiabilitiesCurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaapProductWarrantyAccrualClassifiedCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_us-gaapProductWarrantyAccrualClassifiedCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="loc_us-gaapAccruedSalariesCurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_us-gaapAccruedSalariesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_AccruedLossesOnDevelopmentContractsCurrent" xlink:label="loc_pdexAccruedLossesOnDevelopmentContractsCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_pdexAccruedLossesOnDevelopmentContractsCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_UnvoucheredInventoryInTransitCurrent" xlink:label="loc_pdexUnvoucheredInventoryInTransitCurrent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_pdexUnvoucheredInventoryInTransitCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaapOtherAccruedLiabilitiesCurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_us-gaapOtherAccruedLiabilitiesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="loc_us-gaapAccruedProfessionalFeesCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_us-gaapAccruedProfessionalFeesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesAndExciseTaxPayableCurrent" xlink:label="loc_us-gaapSalesAndExciseTaxPayableCurrent" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapAccruedLiabilitiesCurrent" xlink:to="loc_us-gaapSalesAndExciseTaxPayableCurrent" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetails6" xlink:title="00000041 - Disclosure - Composition of Certain Financial Statement Items (Details 6)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:to="loc_us-gaapOtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaapOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:to="loc_us-gaapOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CompositionOfCertainFinancialStatementItemsDetailsNarrative" xlink:title="00000042 - Disclosure - Composition of Certain Financial Statement Items (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/WarrantyAccrualDetails" xlink:title="00000043 - Disclosure - Warranty Accrual (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/WarrantyAccrualDetailsNarrative" xlink:title="00000044 - Disclosure - Warranty Accrual (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails" xlink:title="00000045 - Disclosure - Income Taxes (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="loc_us-gaapCurrentFederalTaxExpenseBenefit" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeTaxExpenseBenefit" xlink:to="loc_us-gaapCurrentFederalTaxExpenseBenefit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="loc_us-gaapCurrentStateAndLocalTaxExpenseBenefit" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeTaxExpenseBenefit" xlink:to="loc_us-gaapCurrentStateAndLocalTaxExpenseBenefit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaapDeferredFederalIncomeTaxExpenseBenefit" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeTaxExpenseBenefit" xlink:to="loc_us-gaapDeferredFederalIncomeTaxExpenseBenefit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaapDeferredStateAndLocalIncomeTaxExpenseBenefit" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapIncomeTaxExpenseBenefit" xlink:to="loc_us-gaapDeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails2" xlink:title="00000046 - Disclosure - Income Taxes (Details 2)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails3" xlink:title="00000047 - Disclosure - Income Taxes (Details 3)">
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_IncomeTaxExpenseBenefitTotal" xlink:label="loc_pdexIncomeTaxExpenseBenefitTotal" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexIncomeTaxExpenseBenefitTotal" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_IncomeTaxExpenseBenefitDiscontinuedOperations" xlink:label="loc_pdexIncomeTaxExpenseBenefitDiscontinuedOperations" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pdexIncomeTaxExpenseBenefitTotal" xlink:to="loc_pdexIncomeTaxExpenseBenefitDiscontinuedOperations" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails4" xlink:title="00000048 - Disclosure - Income Taxes (Details 4)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent" xlink:label="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" xlink:label="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsInventory" xlink:label="loc_us-gaapDeferredTaxAssetsInventory" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_us-gaapDeferredTaxAssetsInventory" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsOtherCurrent" xlink:label="loc_pdexDeferredTaxAssetsOtherCurrent" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_pdexDeferredTaxAssetsOtherCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsNetOperatingLosses" xlink:label="loc_pdexDeferredTaxAssetsNetOperatingLosses" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_pdexDeferredTaxAssetsNetOperatingLosses" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsStateTaxesCurrent" xlink:label="loc_pdexDeferredTaxAssetsStateTaxesCurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_pdexDeferredTaxAssetsStateTaxesCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowanceCurrent" xlink:label="loc_us-gaapDeferredTaxAssetsValuationAllowanceCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsLiabilitiesNetCurrent" xlink:to="loc_us-gaapDeferredTaxAssetsValuationAllowanceCurrent" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsGrossNoncurrent" xlink:label="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards" xlink:label="loc_us-gaapDeferredTaxAssetsTaxCreditCarryforwards" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsTaxCreditCarryforwards" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaapDeferredTaxAssetsOperatingLossCarryforwards" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsOperatingLossCarryforwards" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsIntangibleAssets" xlink:label="loc_pdexDeferredTaxAssetsIntangibleAssets" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsIntangibleAssets" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent" xlink:label="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent" />
      <link:calculationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsOtherNoncurrent" xlink:label="loc_pdexDeferredTaxAssetsOtherNoncurrent" />
      <link:calculationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsOtherNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsStateTaxesNonCurrent" xlink:label="loc_pdexDeferredTaxAssetsStateTaxesNonCurrent" />
      <link:calculationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsStateTaxesNonCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsLiabilitiesDepreciationNonCurrent" xlink:label="loc_pdexDeferredTaxAssetsLiabilitiesDepreciationNonCurrent" />
      <link:calculationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsLiabilitiesDepreciationNonCurrent" xlink:type="arc" weight="-1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsGoodwill" xlink:label="loc_pdexDeferredTaxAssetsGoodwill" />
      <link:calculationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsGoodwill" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="pdex-20150630.xsd#pdex_DeferredTaxAssetsFederalImpactOfStateTaxesNonCurrent" xlink:label="loc_pdexDeferredTaxAssetsFederalImpactOfStateTaxesNonCurrent" />
      <link:calculationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_pdexDeferredTaxAssetsFederalImpactOfStateTaxesNonCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits" xlink:label="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits" />
      <link:calculationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities" xlink:label="loc_us-gaapDeferredTaxAssetsUnrealizedLossesOnTradingSecurities" />
      <link:calculationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsUnrealizedLossesOnTradingSecurities" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaapDeferredTaxAssetsNetNoncurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsNetNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsGrossNoncurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent" xlink:label="loc_us-gaapDeferredTaxAssetsValuationAllowanceNoncurrent" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapDeferredTaxAssetsNetNoncurrent" xlink:to="loc_us-gaapDeferredTaxAssetsValuationAllowanceNoncurrent" xlink:type="arc" weight="-1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails5" xlink:title="00000049 - Disclosure - Income Taxes (Details 5)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetails6" xlink:title="00000050 - Disclosure - Income Taxes (Details 6)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/IncomeTaxesDetailsNarrative" xlink:title="00000051 - Disclosure - Income Taxes (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleDetails" xlink:title="00000052 - Disclosure - Discontinued Operations and Real Estate Held for Sale (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/DiscontinuedOperationsAndRealEstateHeldForSaleDetailsNarrative" xlink:title="00000053 - Disclosure - Discontinued Operations and Real Estate Held for Sale (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/InvestmentInRamseyPropertyAndRelatedNotesReceivableVariableInterestEntityConsiderationsDetailsNarrative" xlink:title="00000054 - Disclosure - Investment in Ramsey Property and Related Notes Receivable &amp; Variable Interest Entity Considerations (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommitmentsAndContingenciesDetails" xlink:title="00000055 - Disclosure - Commitments and Contingencies (Details)">
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDue" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueCurrent" />
      <link:calculationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDue" xlink:to="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueInTwoYears" />
      <link:calculationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDue" xlink:to="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:type="arc" weight="1" />
      <link:loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueInThreeYears" />
      <link:calculationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDue" xlink:to="loc_us-gaapOperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:type="arc" weight="1" />
    </link:calculationLink>
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:title="00000056 - Disclosure - Commitments and Contingencies (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensationDetails" xlink:title="00000057 - Disclosure - Share-Based Compensation (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensationDetails1" xlink:title="00000058 - Disclosure - Share-Based Compensation (Details 1)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensationDetails2" xlink:title="00000059 - Disclosure - Share-Based Compensation (Details 2)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/Share-basedCompensationDetailsNarrative" xlink:title="00000060 - Disclosure - Share-Based Compensation (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/MajorCustomersSuppliersDetailsNarrative" xlink:title="00000061 - Disclosure - Major Customers &amp; Suppliers (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/LossPerShareDetails" xlink:title="00000062 - Disclosure - Loss Per Share (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/LossPerShareDetailsNarrative" xlink:title="00000063 - Disclosure - Loss Per Share (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/CommonStockDetailsNarrative" xlink:title="00000064 - Disclosure - Common Stock (Details Narrative)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SegmentInformationDetails" xlink:title="00000065 - Disclosure - Segment Information (Details)" />
    <link:calculationLink xlink:type="extended" xlink:role="http://pro-dex.com/role/SubsequentEventsDetailsNarrative" xlink:title="00000066 - Disclosure - Subsequent Events (Details Narrative)" />
</link:linkbase>
