The USB Power Meter can be used to check the actual power consumption of the camera (phone, iPad, or any other USB powered device). It inserts between the battery or charger and the device and displays the voltage and current in real time.
This allows you to understand the actual power consumption of the camera in various modes and test the charging rates in various configurations.
Measures voltages from 3.0 to 7.0 volts (±0.1V). Current from 0 to 2.5A (±0.01A).