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(Gleaned from various postings and youtube videos.) The Eversame USB Digital Power Meter aka Juwei USB Safety Tester Model J7-t. Specifications Detector Instructions. '2” ,, ' ' ”~Mttt'ons thank you for t housing our USB Safety Detector, this is electronic. ('qtllplttt'ltt with compact size, J7-T USB Tester Current and Voltage Detector Mobile Power Battery Capacity Test Table Digital Voltmeter Ammeter Detector. Features: 1.This test can be a USB The Eversame USB Digital Power Meter aka Juwei USB Safety Tester Model J7-t Specifications Input Voltage: 3V - 30V Input Current: 0 - A Accuracy: +/- 1% 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 The former Test Reference Manual Tester discharge capacity value is cleared,and the mobile power is fully charged. Package include. 1 x USB Voltage Current