Cartman 12V Car Battery & Alternator Tester - Test Battery Condition & Alternator Charging
*LED display indicates condition*Charger check: when red light is lit, charging is complete.*Alternator check : accelerate your engine to 2000 rpm when the red light is lit ,charging circuit is ok.*Battery check: indicate the percentage charging in the battery.*Cranking check : red light must remain lit when starter motor operates.