For the Do-It-Yourself Engine Troubleshooter Performs tune-up and troubleshooting tests on computer-controlled, as well as older vehicles. Includes automotive tests such as tach and dwell. Allows testing of fuel injectors, sensors, alternators, spark plug wires, ignition and charging systems, battery condition and cranking voltage. Features 10 megohm input impedance for measuring sensitive computer-controlled components. Easy to read digital liquid crystal display with automatic zero adjust on all functions. Overload protection provided on all ranges.