This ingenious tool performs all standard electrical tests for on-car and bench troubleshooting, including tach, dwell, volts, ohms and diode. This unit tests starting and charging, ignition and fuel delivery systems. It allows the user to locate faulty wiring and components. The Auto TroubleShooter features an extra-large, easy-to-read digital LCD, on-screen test leads connection reminder, automatic reverse polarity indication, automatic zero adjust, and overload protection on all ranges. Includes protective boot, detachable color-coded test leads, alligator clips and detailed instructions.