12 Volt Car Battery Tester Auxiliary Battery Tester

12 Volt Car Battery Tester Auxiliary Battery Tester. the car auxiliary battery is very important since it powers up your car accessories and startup system without it the car wont start. in many cases the 12 volt car battery becomes weak not having enough power to start all car startup systems giving engine check lights for unrelated systems and causing many problems in other areas of the car keeping away any suspicion that the battery is faulty. This car battery tester is perfect to tell you when to replace the 12 volt car battery before it completely dies out and get you stranded.