ITEM NAME:USB Charger Doctor Voltage Current Meter Mobile Battery Tester Power Detector. USB Charger Doctor Voltage Current Meter Mobile Battery Tester Power Detector. Feature: Voltage, current, power / energy / capacity USB stick. Connect it to a power source (power bank, cellphone, USB power adapter, etc.), then connect a load to the other end. It automatically displays voltage, current, elapsed time and power in mAh. Everything is managed by an integrated microcontroller with 24C02S 256-byte EEPROM non-volatile memory. Reset button on top (RTZ - return to zero). Good workmanship and good performance. Easy to use. Long lifetime. Specification: Brand new Size about. 73 * 23 * 13.5mm Input: USB Output: USB Voltage: 3V-9V (1% accuracy) Current: 0-3A (0.4% accuracy) Battery capacity: 0-99999mah Working time: 0-99 hours Sampling rate: 2Hz Display refresh rate: 2Hz The working time and capacity are stored in non-volatile memory (so you can pause the measurements). RTZ, reset button, hold down for three seconds. Package Included: 1x USB Tester -.Find many great new & used options and get the best deals for USB Charger Doctor Voltage Current Meter Mobile Battery Tester Power Detector. at the best online prices at ! Free shipping for many products!