[Two-Way Measurement] The tester can be connected to the charging adapter or charging cable socket, making it easy to identify charging issues with digital devices. [Data Storage] Intelligent memory data charging, monitoring, and memory measurement data capacity. It can store up to 10 sets of measurement data, which can be cleared with a single button, ensuring data protection. [Intelligent Flashing] High or low voltage alarm, LCD screen display, and indicator light backlight alarm through flashing lights. Press the button, and the LED screen will illuminate for approximately 30 seconds. [Accurate Measurement] Accuracy: plus or minus 1%, measurement data is precise. Input voltage: 3V-15V, voltage resolution: 0.01V, test current: 0.05A-3.00A, current resolution: 0.01A, power range: 0-19999 mAh. [Test Range] Improve charging efficiency, protect electronic devices, and perfectly measure the current, voltage, and battery capacity of all 5V USB digital devices such as tablets, mobile phone batteries, power banks, 5V routers, etc.