1.Car Battery Tester --- A great helper to check car battery health, starting and charging, so you can know accurately whether the battery needs to be replaced or just recharged. Save your time and money. 2.12V Wide Application --- This universal battery tester fits all 12V charging systems, including ordinary flooded, AGM flat plate, AGM and GEL spiral for vehicles, forklifts, hybrid cars, SUVs, vans, boats, RVs, motorcycles, travel trailers. 3.6-LED digital display---6 intuitive LED lights display battery and alternator status, green means good/full, orange means medium, red means low. Very simple. No need to know the voltage, you can tell the quality of battery and alternator directly. 4.More Accuracy and Fast Response---2 copper clips more sensitive and accurate, get results as soon as possible. 5.Safety and Simplicity---Reverse protection function prevents burnout caused by improper operation between terminal (+ ) of the battery and the cable terminal (-). The non-slip design allows you to use it flexibly even with gloves.