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. This product also supports custom mode within a range of 9.5-100V. DISPLAY: Features a digital LCD display with backlight and a reinforced waterproof screen. It simultaneously displays battery voltage and remaining capacity, allowing users to clearly view the battery status. 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 light, alerting the user that the battery needs charging. 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, enhancing accuracy and ease of use. 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: Other items shown are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.