QC2.0 3.0 4-20V USB Tester Meter Voltmeter Ammeter Power Capacity Detector Mobile Power Current Charger Voltmeter Ammeter 100% and High Quality USB Charger Doctor Mobile Battery Tester Power Detector Voltage Current Meter This is the mini USB meter. It can measure voltage, current, power and capacity It can clearly display all the data. Can easily measure the USB ( PC USB, cell phone charger, car charger , mobile power , etc. ) port and device operating current and the output voltage charge-discharge capacity, performance, and judge the performance of the charging cable charging equipment, this tester can meet the requirements Fit to factories, laboratories and personal use, wide range and Easy to use, easy to take alone, no additional power supply, Plug and play. Material: Plastic Color: Black Voltage: 4-20v+/-1% Current: 0-3A+/-1% Time: 0-99H Net weight: 19g Size:59mm*23mm*13.5mm(length*width*height)