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Check the listing for details. Automatic Range Conversion 1Hz-50MHz Crystal Frequency Counter Tester LED PCB F. Condition: New. Listed at 11.48 USD. Material: PCB. Automatic range conversion, without human switching;. 1 Frequency Counter. Duplex Repeater Interface Cable For Motorola Radio CDM750 M1250 CM300 GM300. You can select the power saving mode, if the frequency is not obvious changes within 15 seconds automatically turn off the display;.