The 12V Battery and System Tester, Part No. BA7, features an operating range of 7-15V and the capacity to test batteries rated between 100-1200 CCA. It adds the convenience of starting and charging system testing and offers quick assessment, providing both a numerical result and a pass/fail LED result. It is compatible with a wide range of battery types, including Conventional, Maintenance Free, AGM, Gel Cell and Marine Cranking Deep Cycle batteries. Small, portable, pocket sized, take it anywhere you need to test batteries. Easy to Use - Operator is guided through each operation. Tests multiple battery types. Bright 4 digit LED display is great for bright or low light settings. LED indication of battery and system pass or fail (as applicable). Reverse polarity and over-voltage protection.