Features: 1Real Time Display: USB tester to be used to detect USB charging current, voltage, etc. digital LCD display for clear readings and real time you display data. 2Quality Detection: USB tester can detect the quality of chargers and cables, providing a safe charging environment for your valuable devices. 3Measurement Range: USB voltage current tester test voltage range of 3?30V, test current range of 0?5.1A. 4Wide Compatibility: USB tester is widely compatible with USB A port devices, such as cell phones, tablets, laptops, car chargers, power packs, wall chargers, cables, etc. 5High Accuracy: The USB tester's internal sampling circuitry of professional instruments, coupled with a unique accuracy algorithm, guarantees the accuracy and stability of the product at both hardware and software levels. Package included: 1 x USB&nbspTester&nbsp&nbsp&nbsp&nbsp