Product selling points: 1. Simultaneous display of voltage and current mAH data, easy to view can detect mobile power output mAH 2. Multi-group detection data preservation, power failure preservation function does not affect data transmission 3. Higher , current parameters not jump basically current sampling 25 mOhm loss smaller 4. With current calibration function, higher current accuracy 5. Safe charging, real-time monitoring and control of your charging data Input voltage: 4-30V Voltage resolution: 0.01V Test current: 0-3A Current resolution: 0.01A Capacity range: 0-19999mAH Accuracy: plus or minus 1% Line loss: about 0.1 ohm Test content: battery voltage, current, discharge capacity (10 sets of data in total) Tips: The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Material: plastic colour: B-White Package Contents: 1 x Voltmeter Tester Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.