
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                       6,982,291
<SECURITIES>                                 9,950,774
<RECEIVABLES>                                6,685,815
<ALLOWANCES>                                   274,885
<INVENTORY>                                  4,490,931
<CURRENT-ASSETS>                            28,311,736
<PP&E>                                      18,761,730
<DEPRECIATION>                              13,024,598
<TOTAL-ASSETS>                              35,183,428
<CURRENT-LIABILITIES>                        9,471,442
<BONDS>                                      7,993,160
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       255,453
<OTHER-SE>                                  16,450,439
<TOTAL-LIABILITY-AND-EQUITY>                35,183,428
<SALES>                                      8,882,933
<TOTAL-REVENUES>                             8,882,933
<CGS>                                        7,433,279
<TOTAL-COSTS>                                7,904,615
<OTHER-EXPENSES>                              (91,677)
<LOSS-PROVISION>                                 4,904
<INTEREST-EXPENSE>                             321,727
<INCOME-PRETAX>                            (6,689,915)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (6,689,915)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (6,689,915)
<EPS-BASIC>                                     (0.28)
<EPS-DILUTED>                                   (0.28)


</TABLE>
