OptiMate TEST State of ChargeOptiMate TEST – State of Charge: State of charge tester for all 12V lead-acid & 12.8V/13.2V Lithium.The ideal parts counter battery voltage tester for all 12V lead-acid and 12.8V / 13.2V Lithium starter batteries. Easily check any battery voltage instantly.Indicates static voltage and state of charge percentage for 12V AGM, GEL and STD lead-acid and 12.8V / 13.2V Lithium LFP/LiFePO4 batteries.Easy to understand comparitive display compares voltage and state of charge for all vehicle starter battery technologies – helps educate customers.Easy to use! Connect with the included clips to the battery or connect to an installed SAE battery lead.Industry standard durability – Built to last!