OPTIMATE MONITOR O-124

Monitor the charge of your stored 12 V motorsport lead acid battery or check if the vehicle charging system is working correctly 2 automatic modes - battery state of charge monitor (single LED flashing) and charging system test (arrow mode) 4 LEDs cover the voltage range ‘full to empty’ voltage range of all 12 V batteries, including higher voltage AGM for power sport (4th vv LED = 12.7 V)