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, and 84V. Custom mode is supported within a range of 9.5-100V. DISPLAY: Features a digital LCD with backlight and a strengthened waterproof screen. Displays battery voltage and remaining capacity simultaneously for clear visibility. POWER-OFF MEMORY: Retains previous function settings after power is disconnected. LOW VOLTAGE ALARM: Triggers when battery power drops below 10%, indicated by a flashing display to alert low battery condition. LOW POWER CONSUMPTION: Self-current consumption is below 15mA in normal mode and less than 1mA in low-power mode. CALIBRATION: Includes a calibration screw hole for easy zero bias adjustment to enhance accuracy. EASY TO INSTALL: Can be mounted on a panel using the included nut and bracket. WATERPROOF & DUSTPROOF: Rated IP67 for protection against water and dust, resistant to water splashes in most conditions. Color: Black Material: Plastic Package Contents: 1 x Battery Capacity Tester Note: Other items not included. Lighting and display differences may cause slight color variation between image and actual item. Measurement error allowance is +/- 1-3 cm.