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2 channel frequency/counter input module, 32 bit 100KHz, 5 bit LED Display, Ethernet Data Acquisition Din Rail Adam Module|frequency counter module| frequency modulemodule ethernet - AliExpress
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Picosecond-precision multichannel autonomous time and frequency counter: Review of Scientific Instruments: Vol 88, No 12
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PCI-FC16U | Universal PCI, 16-Channel counter / frequency board with 32-channel programmable digital input digital output (RoHS)… | Digital filter, Digital, Channel
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