The Snap-on MicroVAT Battery, Starting, and Charging System Tester is designed to perform automated tests in under a minute and allows the technician to diagnose a battery in under five seconds. MicroVAT takes advantage of impedance/current test technology to detect the full range of battery failure modes including bad cells, sulfation, internal shorting, and other chemical and physical failures. Features include automated diagnostic tests, automated system tests of the vehicle battery, alternator and starter.