Power off memory function that stores capacity and energy data when the mobile power supply is switched off. This practical for later display and practical for capacity energy measurement of the mobile power supply This USB C tester measures the voltage: 4V-30V; measuring current: 0-6.5A. They are widely used in the quality testing of 3C products for digital peripherals and are the first for digital and electronics enthusiasts 1 Click the button once to cycle the screens. 2. Double click on the button to rotate the displayed content. 3. Press and hold the button (3 seconds): clear all capacity, current quantity and time information USB Voltage Tester 3.0 – LCD – Capacity, Power, Voltmeter, Battery Charge, Power Bank, Voltmeter, Ammeter The type C USB tester supports QC20 / 3.0, Super and supports monitoring electrical signals during the PD 2.0 / 3.0 fast charging protocol and thus meets the requirements of different mobile phone users, Manufacturer: huiouer