Features Strong Applicability: The USB tester can measure the voltage when the USB power supply equipment is no-load, and the voltage and current when the USB terminal equipment is working. Easily measure the output voltage of the USB port and the working current of the equipment. Feature: The electric energy tester adopts a new generation of 4 1/2 semi-integral cyclic conversion integrated circuits, equipped with a accurant band gap reference source, which supports accurate range, high precision, stable operation, reliable performance, strong anti-interference ability and high temperature resistance. Wide Use: The USB detector can detect how much current the mobile phone is charging. It can also detect that the performance of the mobile phone charging line is poor. The USB tester can also detect whether the voltage and current output by the USB charger meet the standard, suitable for factories, laboratories and users. Easy to Use: With current and voltage cycle display, USB tester is easy to use and practical, which can be small and easy to carry, no need for additional power. The USB detector in compact size is without power supply and other auxiliary equipment, plug and play. Poor Measurement: The USB detector can measure poor performance, a low internal resistance charging line can get the specified charging current of the mobile phone. If a high-impedance charging cable is used, the charging current will not go up. Specification: Item Type: USB tester Color: Blue / White (optional) Working Range: Voltage: 3.5V-7V Current: 0A-3A Resolution: Voltage: 10mV Current: 1mA Error: Voltage: <±1% Current: <±2% Full-Scale Voltage Drop: 200mV (when measuring current) Working Temperature: 0-60℃Size: Approx. 14mm / 0.6in Approx. 20mm / 0.8in Approx. 52mm / 2in Package List: 2 x USB Tester Package List 2 x USB Tester