USB current and voltage charger capacity tester USB 3-20V charger power meter

features: Measure the current and voltage of the power supply unit through the USB port. Plug and play without additional power. The voltage and current will display a circle. Small size, easy to carry. Specifications: Possible range: 4-20V, 0-3A. Resolution: voltage is 10mV, current is 10mA. Error range: voltage<± 1%, current<± 2%. Full scale voltage drop: 200mV. Operating temperature: 0-60 ° C. Color: transparent, blue Package includes: 1 x USB current voltage capacity tester