Improves driving safety: builtin brightness LED backlight allows clear reading of voltage values in dim light or at night, with a soft backlight color that preserves night vision. Safety monitoring: low voltage alarm reminds the driver to check battery status in time and helps avoid unintended stoppages. The alarm sounds when vehicle voltage falls below the preset safety range, enabling efficient monitoring and safer operation on the course. Multipurpose battery tester: provides realtime monitoring of battery status and accurate voltage measurement across a wide voltage range, supporting 12V84V vehicle systems. Wearresistant construction: manufactured from quality ABS material for toughness and reliability. Its wearresistant, strong structure ensures a long service life. Use scenarios: Before a round: check battery health and voltage to ensure sufficient power for the course. During play: monitor voltage in real time and rely on the low voltage alarm to avoid unexpected stoppages. Maintenance or charging: test and verify battery performance across 12V84V systems in workshop or charging station settings.