USB Detector Voltmeter Ammeter Power Capacity Tester

1. Easy to measure the output current and voltage 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.
2. With the time and capacity storage, you could also measure the total capacity in mAH.
3. No battery, no on/of switch, plug and play.
4. Durable and safety.
5. Small size and lightweight, easy to carry.