You may wonder if the battery needs to be replaced or just needs recharging. BM310 car battery checker tell you the battery health by battery and alternator test. Save your trip and money by avoiding sending good batteries to car manufacturers The car battery tester is for all 12V charging system, including regular flooded, AGM flat plate, AGM spiral and GEL batteries for vehicles, forklifts, hybrid cars, SUVs, Pickups, Boats, RVs, Motorcycles, travel Trailers. The 12V battery analyzer is perfect for home usage and commercial usage. Six LED lights show the status of battery and alternator, green means good/full, orange means middle, red means low. Intuitive, simple and clear. No need to know the voltage, we directly tell you the quality of the battery and alternator.The reverse protection function prevents burnout caused by misoperation between the (+)battery post and (-)cable terminal. Pure copper wire and clip make excellent conductivity and high sensitivity. No-slip design makes you are able to use it flexibly even wearing gloves.