A convienent, easy-to-use tool that tests ignition modules, most sensors, diodes and wiring. For GM, Ford, Chrysler, Honda, Toyota and Nissan vehicles with non-DIS systems. Tests sensors including O2, MAP, MAF, knock and crankshaft sensors. Also tests ignition modules and igniters. Easy to use instruction manual details hookup and test procedures. Back probe included for in-circuit testing. 9v battery operated. Computer safe.