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. This product also supports custom mode within the range of 9.5-100V. DISPLAY: Features a digital LCD display 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 flashing display to alert low power. LOW POWER CONSUMPTION: Self-current consumption is below 15mA in normal mode and less than 1mA in low-power mode. CALIBRATION: Includes calibration screw hole for zero bias adjustment to enhance accuracy. EASY TO INSTALL: Can be mounted on panel using included nut and bracket. 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 different displays may cause slight color variation between image and actual item. Measurement error allowed is +/- 1-3cm.