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DIY Frequency Tester 1Hz-50MHz Frequency Counter Module Crystal Oscillator Tester Module Kit Frequency Indicator with Housing Kit

DIGITEN 0-999999 Digital LED Counter +PhotoElectric Switch Sensor +Reflector Automatic Conveyor Belting 100-240VAC 6 Digits Mini Customer Traffic Counter Electronic Totalizer

Norsat C-Band LNB 3120CF

HEATHROW SCIENTIFIC HS5360A Benchtop Counter, 6-Key, 9.8" L x 3" W x 2.2" H

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DIGITEN 0-999999 12-24VDC Digital LED Counter +PhotoElectric Switch Sensor +Reflector Automatic Conveyor Belting