HD LCD Display: The improved USB colour tester has a colour HD digital LCD display for clear readings, more accurate measurements and provides more reliable values. Multifunctional: The USB meter tester is mainly used to test USB charging current, voltage, capacity, power and time, displaying accurate data for you in real time; testing the quality of chargers and cables to provide a safe charging environment for your devices. the USB tester can automatically detect different fast charging protocols and is simple and easy to use. Wide Test Range And Simple Operation: Voltage range: 4‑30V, current range: 0‑6.5A. The large measurement range of the USB meter makes it widely compatible with USB A port devices such as mobile phones, tablets, laptops, car chargers, power packs, wall chargers, cables, etc. The USB A range is compatible with a wide range of USB A port devices such as mobile phones, tablets, laptops, car chargers, power packs, wall chargers, cables, etc., with real time display of loading data. Accuracy and Stability: The internal use of professional instrument sampling circuitry, coupled with unique accurate algorithms, ensures accuracy and stability at both hardware and software . Small And Portable: The USB tester is small and lightweight, providing a safe charging environment wherever you go.