Versatile: The UT658 USB tester measures output voltage, current, energy, capacity, equivalent circuit resistance, D+ and D- voltage of USB data cables, and more. This series is designed to be accurate, reliable, stable, and portable. Real-time Monitoring: The LCD screen can display all digital measurements, making it easy to view the power and voltage of your devices and monitor charging efficiency at any time to protect your charging equipment. Dual Port: Test most USB-A or USB-C standard ports and identify fast-charging modes, recognizing QC 1.0/2.0/3.0/4.0. This practical design for testing devices is accurate, reliable, and stable. Superior Quality: The casing is made of high-quality white ABS material, which offers excellent insulation and is very aesthetically pleasing. Wide Range of Applications: Used in many applications: PC/Laptop/Desktop/Mobile Phone/Power Bank/Charger/Discharge Load/Car Charger/Cable Measurement.