ITEM NAME:USB Power Current and Voltage Tester USB Mobile Power Current Test R6L4 USB Power Current and Voltage Tester USB Mobile Power Current Test R6L4 Voltage: 3v-7v error 0.1v Current :0-2.5A error 0.01A It can measure the USB-.Current :0-2.5A error 0.01A. Wide range of applications, any phone, any electronic product, Easy to use.