Whether you are troubleshooting your vehicle's charging system or tracking down an electrical short, 582 can do the job. 582 features a very unique system of Amp Shutters which block the unused test lead jacks. The amp shutters prevent mistaken operation, blown fuses and greatly improves user safety. 582 also features a fused 20 Amp test range in both DC and AC. Among other notable features are the highly visible, extra large 2 inch digits with backlighting. The complete list of testing functions includes: DC/AC Volts, DC/AC Current, Resistance, Frequency, Capacitance, Temp F & C, Audible Continuity and Diode Test.