3 In 1 Digital Multi-function USB Tester

3 in 1 USB Tester for Charger Voltage Current Detector, Mobile phone Power Voltage Current Multi meter USB Charger Detector, Digital Multi-function USB Charger / USB Out Voltage Current Capacity Multi meter Detector.The working time and Capacity have Memory function when power off
Voltage: 4V-20V ( 1% accuracy )
Current: 0-3A ( accuracy of 0.4% )
Battery Capacity (0-99999mah)
Working time (0-99Hour)