Measure the output current(0A-3.3A) and voltage(4V-9V) of a USB power supply. With the multimeter you could know clearly the charging status of your phone or tablet and distinguish bad chargers and cables.;With the time(0-99hours) and capacity storage(0-99999mAh), you could also measure the total capacity in mAH;Press and hold the RESET button to reset;Smart little gadget - a necessity for modern tech fellow;No battery, no on/off switch, plug and play

• MUKER-TM103 USB Power Multi meter Voltmeter Ammeter Voltage(4V-9V) Current(0A-3.3A) High Precision LCD Display for Mobile Power Banks & Other USB Charging
• TM-103

MUKER-TM103 USB Power Multi meter Voltmeter Ammeter Voltage(4V-9V) Current(0A-3.3A) High Precision LCD Display for Mobile Power Banks & Other USB ChargingMuker