Techno Tools Corp. offers the Heavy Duty 12/24/36V Electronic Battery Tester Model No. B400. The B400 tests 12V heavy-duty auto, truck, commercial and marine batteries and 12/24/36V starter and charging systems, and battery size is not required to be entered. The battery voltage displays automatically when the tester is connected to the battery. The LED Bar Graph immediately displays battery condition upon pressing the TEST button. The No. B400 features heavy duty abrasion resistant cables 4' in length for trucks and buses with hard to reach battery compartments.