Techno Tools Corp. offers the 12V Electronic Battery Diagnostic Tester, No. B300. The No. B300 features a testing method that does not require the battery size to be entered into the unit, just chosen between automotive or truck battery or small automotive type batteries for testing. The No. B300 eliminates tester input errors and allows the testing of batteries of unknown size. The unit can test batteries as low as five percent state of charge and still give accurate readings. The LED Bar Graph immediately displays battery condition upon pressing the TEST button.