12V LED TESTER FOR BATTERIES AND GENERATORS DIGITAL (SK2028-1)

LED display indicates condition Charger check: when the red light is on, charging is complete. Alternator check: accelerate your engine to 2000 rpm; when the red light is on, the charging circuit is OK. Battery check: indicates the percentage of charge in the battery. Cranking check: the red light must remain on when the starter motor operates.