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MTI Instruments sells its products on a worldwide basis with its principal markets listed in the table below where information on product revenue is summarized by geographic area for the Company as a whole for each of the years ended December 31 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Product revenue | $ 1,640 | $ 1,337 | [1]
UNITED STATES |  |  |
Product revenue | 836 | 909 |
A S E A N [Member] |  |  |
Product revenue | 743 | 242 |
EMEA [Member] |  |  |
Product revenue | 57 | 166 |
CANADA |  |  |
Product revenue | $ 4 | $ 20 |
[1] | Reclassified to conform with the current period presentation

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