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. Custom mode supported within 9.5-100V range. DISPLAY: Features a digital LCD with backlight and reinforced 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, alerting user to recharge. LOW POWER CONSUMPTION: Self-current consumption below 15mA in normal mode and under 1mA in low-power mode. CALIBRATION: Includes calibration screw for easy zero adjustment to enhance accuracy. EASY TO INSTALL: Designed for panel mounting with included nut and bracket for simple installation. WATERPROOF & DUSTPROOF: Rated IP67 for protection against water splashes and dust in most conditions. Color: Black Material: Plastic Package Contents: 1 x Battery capacity tester Note: Light reflection and display differences may cause slight variation in color compared to actual item. Measurement error allowance is +/- 1-3 cm.