APPLICABLE BATTERY: Supports 3-20 series lithium battery pack, 4-24 series lithium-iron battery pack, and lead-acid batteries of 12V, 24V, 36V, 48V, 60V, 72V, 84V. Custom mode supported within 9.5-100V range. DISPLAY: Digital LCD with backlight and strengthened waterproof screen displays battery voltage and remaining capacity simultaneously for clear visibility. POWER-OFF MEMORY: Maintains previous function settings after power is disconnected. LOW VOLTAGE ALARM: Triggers when battery level drops below 10%, indicated by a flashing battery icon to prompt charging. LOW POWER CONSUMPTION: Self-current consumption below 15mA in normal mode and under 1mA in low-power mode. CALIBRATION: Includes calibration screw for zero bias adjustment to ensure accuracy. EASY TO INSTALL: Panel mountable with included nut and bracket for simple installation. WATERPROOF & DUSTPROOF: Rated IP67 for protection against water splashes and dust. Color: Black Material: Plastic Package Contents: 1 x Battery capacity tester Note: Light reflection and display differences may cause slight color variation between image and actual item. Measurement error allowance is +/- 1-3cm.