The SBT1 Schumacher SHUlink Wireless Battery / System Tester is a three-in-one battery tester; battery tester for testing 6 and 12 Volt batteries, charging system tester for testing 12 and 24 Volt charging systems and starting system tester for testing 12 and 24 Volt starting systems. Performs Battery Test displaying state of charge %, Battery voltage, Measured capacity in user selectable rating/ CCA /SAE etc...) 40-2000 CCA. Works with all types of batteries, AGM Spiral, Flooded, AGM Flat Plate, VRLA / Gel. Performs system test displaying cranking volts, alternator idle volts, alternator load volts and diode ripple. Test results can be stored for later retrieval and easily emailed....