Welcome to the store! 1. Featuring an LCD design, this tester displays current, voltage, and battery capacity on the same screen for quick and easy monitoring. 2. Simply connect the USB male connector to the micro USB on chargers, mobile phones, and other devices to directly read voltage and current parameters. 3. Even when the mobile power is off, capacity and energy data are stored for easy follow-up inspection and measurement of mobile power capacity and energy. 4. No professional wiring is needed! Just plug into the USB port to detect real-time USB power, voltage, current capacity, and other indicators. 5. Input MAH for up to 9 groups of charging equipment to save power, making it convenient to check and detect whether the charging equipment's capacitance data is accurate. Item Type: USB Tester Material: ABS Voltage: 4-30V Current: 0-6.5A Mah: 0-999999 mah Mwh: 0-999999 Mwh Time: 0-99 hours Power: 0-150W Charging Resistance: 0-999.9 ohms Grouping: 1-9 groups Internal Temperature: 0-80 ℃ D Positive Voltage: 0-10V D Negative Voltage: 0-10V Keypad: Function Button Interface: USB How to use: 1. Click the button to view the charging data saved by groups 1-9. 2. Long press the button for 3 seconds to delete the charging data saved by a single group. 3. Double-click the button quickly to change the display page. 4. Long press this button and then connect it to enter voltage calibration. Includes: 1 x Digital USB Voltmeter Tester 1 x Manual Your 100% satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!