Our Car Diagnostic Tool is the newest battery tester upgraded from the old classic backlit tester in the market, aiming at check battery health fast and accurately, as well as check the alternator working status. It's a professional vehicle diagnostic tool for checking your battery system issues by using the graphing voltage monitoring tool, with its color screen and unique pattern design, life time free update service, the KONNWEI KW210 is a perfect battery testing tool for your job and the family.