DIY Digital LED Frequency Counter 1Hz-50MHz USB 5V Crystal Oscillator Meter Tester Kit - EveryMarket
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Keysight 53220A - Universal Frequency Counter/Timer (2 Channel / 350 MHz / 12 Digits / 100ps) | TEquipment
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Foxdelta FC4: PIC18F2550 USB 50/500MHZ Frequency Counter and RF Meter By Tony/I2TZK, Frank/k7sfn, Dinesh/VU2FD
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