This efficient and fast-performing battery and alternator tester gives users immediate identification of voltage output in cars and vehicles. The battery tester is designed for compatible use with 12V DC systems only. The LED offers the user three alternator readings of Strong (14V), Normal (13.5V), Low (13V) and three battery readings, Good (12.5V), Fair (12V), Poor (10V), to quickly identify if either are at fault. Features and Benefits This battery and alternator tester is extremely simple and easy to use whilst offering a fast and efficient reading LED gives immediate result of voltage reading as well as a rating on quality of voltage The tester is designed with a magnetic back which can easily be secured to the vehicle in use for hands-free application Typical Applications For use on cars and vehicles when testing alternator and battery readings Notes Suitable for 12V DC systems only