About this article REAL-TIME MONITORING: Monitor charging efficiency at any time to protect charging equipment. With LCD display, easy to see the current and voltage of the devices MULTIFUNCTION: The UT658 measures the output voltage, current, energy, capacitance, equivalent resistance of the circuit, D+ and D voltages of the USB data cable, etc. USB PORT: With a USB port and micro USB interface, convenient for testing devices. Designed to be accurate, reliable and stable. INSULATED HOUSING: The housing is made of high-quality white ABS, which provides excellent insulation and a very beautiful appearance. APPLICATION The second generation of UT658 series USB testers can inspect USB chargers, portable power sources, data cables, and other electronic charging devices.