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29 Jun 2017 USB meter: Safety tester J7-t. DSC_5521 Official specifications: Input Voltage: 3V - 30V; Input current : 0 - 5.1A; Cumulative capacity range: 0-999.99 Ah 28 Sep 2017 Upward compatible "COOWOO USB current voltage trigger meter fast When I removed it, there was a Japanese instruction manual below. 23 Jun 2017 Multifunction:COOWOO smart digital USB meter can be used to test voltage, Safety Guard: Built in protective electronic switch element for detecting safety,
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