Tirol 12 Volt Auto Battery and Alternator Tester with LED Car Battery Tester This battery tester, safe and easy to operate, has multiple functions: alternator state check, battery state check, check before charge and overload display, telling us the state of alternator and battery, thereby assuring our driving safety. Multiple functions: alternator state check, battery state check, check before charge and overload display. 6-LED display, clearly present the alternator and battery state.Two testing clips for safe and easy operation.Small size and light weight, convenient to carry.Fit car, motorcycle, etc., with 12V battery. Suitable for 12V lead acid batteries, hardtop batteries, discharge batteries and maintenance free batteries.heavy duty insulated clamps. Easy and safe to use, no sparking. And it with a good chip inside, so it is not easy to get hot on the surface.Six LED lights display indicates condition