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 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: Activates 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 below 1mA in low-power mode. CALIBRATION: Includes a calibration screw hole for zero bias adjustment, allowing easy calibration by turning the screw for improved accuracy. EASY TO INSTALL: Can be easily mounted on a panel using the included nut and bracket. WATERPROOF & DUSTPROOF: Rated IP67 for protection against water and dust, providing resistance to water splashes in most conditions. Color: Black Material: Plastic Package Contents: 1 x Battery capacity tester Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3cm.