Fangrui Product Details Multifunctional: This Usb Tester Is Designed To Detect The Voltage, Current, Capacity, Power, Power, Temperature, Resistance, Charging Time And Other Data Of Usb C Devices, Which Is Convenient For Power Supply And Quality Testing. Detect Fast Charging Protocols: Type-c Usb Tester Supports Qc2.0/3.0/4.0, Super Vooc, And Supports Electrical Signal Monitoring In Pd2.0/3.0 Fast Charging Protocols To Meet The Needs Of Mobile Phone Users. [ Measurement Data] The Power-off Function Can Save The Capacity And Energy Data When The Mobile Power Is Turned Off, Which Is Convenient For Subsequent Viewing, And It Is Also Very Convenient To Measure The Capacity Of The Mobile Power. Wide Applicability: This Usb C Tester Measures Voltage: 4v-30v; Measures Current: 0-6.5a. Tester Is Widely Used In The Quality Inspection Of 3c Digital Peripheral Products, And Is The For Digital Gamers And Electronics Enthusiasts. [key Function] 1. The Button To Switch The Screen In A Circular Manner; 2. Double-click The Button To