This is a KEWEISI USB Current Voltage Tester that can measure voltage and current in you USB charger or USB power devices. This KEWEISI USB Current Voltage Tester help you to check whether you device over voltage or over current.
Please note this will not regulate the voltage. this is only a voltage and current meter.
Specifications
Current
5A Max (if more than 3a, error will be larger than 3%)
USB
USB-A Male - Input
2 x USB-A Female - Output
Voltage
Measuring range - 3V ~ 9V