USB battery tester KWS-V20 with a measurement error of about 3%

[@Kositsyn83]

This tester can measure voltage from 4 to 20 Volts and load current up to 3 Amps. With an input voltage of 5-12 Volts, the tester will have a measurement error of approximately 3%. This is due to the voltage drop across the shunt in the tester.

[@neeleshrana4719]

Good