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Check the listing for details. Automatic Range Conversion 1Hz-50MHz Crystal Frequency Counter Tester LED PCB D. Condition: New. Listed at 12.99 USD. Material: PCB. Automatic range conversion, without human switching;. 2Pcs T Male To HXT 4.0MM 4.0 Adapter Lipo Battery Bullet Deans Cordles w. 1 Frequency Counter. You can select the power saving mode, if the frequency is not obvious changes within 15 seconds automatically turn off the display;.