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Product Features: Current: 0-5.1A Voltage: 4-30V Timing: 0-99 hours Power: 0-155W Capacity: 0-99999mAh Inner Temperature: 0-80 degree Accuracy: +/- 1% Display: LED, show voltage and current simultaneously Divide into groups: 0-9 group Operating guide: 1. Click the button to view 1-9 sets of charging data. 2. Long press the button for 3 seconds to remove a set of charging data. 3. Double-click the button to rotate the screen to view. Currents calibration method: Please long press buttons and do not let it go,and then use the plug insert tester Type C socket.When the display screen can display properly,reset has been completed. Please kindly note:In current calibration, the tester instrument not connect any load. Package Included: 1 x Type-C Voltmeter USB-C Voltage Current Tester 1 x Operation manual