Battery Voltage Percentage Tester LCD Display Ternary Lithium Remaining Battery Detector Meter Monitor Item Type: Lithium Battery Percentage Meter Material: PC Model: PZEM 009 Voltage: DC8-100V Screen: LCD Measurement Accuracy: 1% (±1 word) Battery Specification: If you want to change the battery specification during use, you can set it yourself as follows: Step 1: Press and hold the button for 1 second until the word 60VL appears on the screen (the exact display varies depending on the battery specification), then release the button. Step 2: Press the button briefly to select the battery specification Step 3: Press and hold the button for 1 second or stop the button action for 2 seconds to save the data and return to the normal display surface. Voltage Calibration: The product is fully calibrated before leaving the factory, or you can calibrate it yourself if you think there is a deviation as follows: Step 1: Press and hold the button in case of power failure Step 2: Input standard DC20V voltage Step 3: LCD will display CAL PASS and return to normal display interface, indicating successful calibration, then release the button. Splashproof Function: The product panel is embedded and sealed, and the panel part has splashproof function after installation. Color LCD Screen: Voltage and percentage and battery sign combination display.