TIROL Digital Car Automative Vehicular Auto Battery Load Tester Checker Analyzer for Trucks, Cars, Motorcycles and More 100 Amp battery load tester that quickly tests for a good, weak or bad battery Suitable for 6 and 12 volt batteriesHold load on 10 seconds features: alternator state check, battery state check, check before charge and overload display. Help you diagnostic and solve your car health problem timely without disconnecting the battery(or on separate battery). Avoid the accident may happen caused by car itself. Accurate indication of battery voltage