How to Test USB Current and Battery Bank Capacity

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Display: Simultaneously display Amp and Volt in real-time Measuring Range: Voltage 3-9V, Current 0-3A, Accuracy: +/- 1% Memory function: The working

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USB Current Voltage Capacity Tester

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LCD USB Voltmeter Voltage Tester Meter Detector Ammeter Multimeter Test Speed of Chargers Cables Capacity of Power Banks