APPLICABLE BATTERY: Supports 3-20 series lithium battery packs, 4-24 series lithium-iron battery packs, and lead-acid batteries of 12V, 24V, 36V, 48V, 60V, 72V, and 84V. Includes a custom mode within the range of 9.5-100V. DISPLAY: Features a digital LCD display with backlight and a strengthened waterproof screen. Simultaneously displays battery voltage and remaining capacity for clear status monitoring. POWER-OFF MEMORY: Retains previous function settings after power disconnection for convenient reuse upon restart. LOW VOLTAGE ALARM: Activates when battery power drops below 10%, indicated by a flashing display to alert the user for charging. LOW POWER CONSUMPTION: Self-current draw is below 15mA in normal mode and below 1mA in low-power mode. CALIBRATION: Includes a calibration screw hole for zero bias adjustment to enhance measurement precision. EASY TO INSTALL: Designed for panel mounting with included nut and bracket. WATERPROOF & DUSTPROOF: Rated IP67, providing protection against water splashes and dust 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 in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.