USB current and voltage meter voltage capacity and voltage meter testing table Features: This is the mini USB meter. 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. Description: DIY Supplies: Electric Display Type: Digital Only Code Accuracy class: Plus or minus 1% Operating temperature: normal Power Supply: AC Voltage: 4-20V+/-1% Current: 0-3A+/-1% Time: 0-99H Specifications: Model: KWS-V20 Material: Plastic Color: Blue Size: 59*23*13.5mm 1. IN - Connect the input terminal to the output port of the charger 2. Press the RTZ reset button for 3 seconds before the screen displays reset 3. OUT - USB port for connecting the output end to the data cable 4. Input voltage display window (3-9V) accuracy ± 1% 5. Charging current display window (0-3A) accuracy ± 1% 6. Battery capacity display window (0-99999mAh) 7. Working time display window (0-99H) Unit: minutes 8. Working time and capacity display with memory function after power outage _x000D_