PowerJive USB Voltage/Amps Power Meter Tester Multimeter, Test Speed of Chargers, Cables, Capacity of Power Banks;

This USB Multi-meter plugs directly into any USB socket or Micro-USB charger or cable. It displays on the screen the voltage, current and capacity. Acts as both a vol and amp meter. All three are shown at the same time so there is no need to switch between screens. It is powered when you plug it in so no batteries are needed. Backlit screen will let you see it in low light conditions. Will handle up to 3.5A which is more than enough to test any cell phone or tablet. The monitor is suitable for 0-2.5 Amps, and 3-7 Volts and has an accuracy better than 1%. It can also give you a rough estimate of the capacity of the device you are charging. Made by PowerJive.