ATD Tools 5490 12V Electronic Battery and Electrical System Tester Specifications battery test range (auto/truck) greater than 390 to 1,400 CCA battery test range LED bar graph immediately displays battery condition upon pressing the test button. No conversion tables needed for CCA, SAE, IEC, EN, or Ah battery condition is shown in percent of capacity Low voltage indicator LED lights when charging is necessary. Bad cell is detected and displayed. Comfortable grip with easy-to-use clamps and tests discharged batteries offering reverse polarity protection Uses conductance technology tests 12 volt charging and starting systems Tests both flooded lead acid and AGM batteries multi-colored bar graph displays battery condition