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GPS or Navigation System: Aweek? GY560 Mini Frequency Counter handheld Frequency Signal Tester for Walkie-Talkies Two Way Radio Transceiver GSM 50 MHz-2.4 GHz - Aweek

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BISS: SainSmart UDB1005S 5MHz DDS Function Signal Generator, Source Frequency Counter DDS Module Wave, Rev3.0 PC Serial Ports - SainSmart

Photography: Safety Technology AVD-110D DIGITAL HIGH END FREQUENCY COUNTER BUG DETECTOR - Safety Technology

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Photography: Gy561 Handheld Frequency Counter Meter for 2Way Radio Walkie Talkie - omyBigDeal

Car Audio or Theater: Mini Radio Frequency Meter With CTCSS/DCS Decoder or Handheld Portable Frequency Counter XH560s Text Walkie Talkie , Black - Walkie Talkie

Car Audio or Theater: IBQ101 handheld frequency counter is a super compact frequency measuring instrument - Walkie Talkie

BISS: RioRand GY560 Mini Frequency Counter-handheld Frequency Signal Tester for Two Way Radio Transceiver GSM 50 MHz-2.4 GHz - RioRand

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