Provides an Easy Way to Check Ignition Systems with Coil-On Plugs. Applications Include Ford, Chrysler, Mitsubishi, Nissan and More. It is the quickest way to test for no-start conditions. An inductive test cannot be performed, because there are no plug wires. High visibility white lettering makes it easy to read the gap measurement from 0 to 40k. The round knob provides easy gap adjustment and the 12" ground wire comes with a shielded clip. The standard plug wire tip and can be unscrewed so the tester can be used on small engines and some motorcycles.