The Matco Tools MDAutowave auto signal waveform viewer allows users to quickly and easily verify that signals and voltages are present in waveform format using a voltage/time scale, all without a scope and more detail than a DVOM. With this tool, users can view ignition systems, fuel injectors, mass air flow, oxygen sensor, throttle position sensor, crank and cam, wheel speed, pulse width modulated components and much more. The MDAutowave automatically sets time and voltage scale with the auto-set feature, save waveform snapshots to a 4GB SD card and perform accurate readings with sample rate of up to 1 million samples/second. The MDAutowave is battery-operated with a color LCD display.