Lisle 20700 Coil-on Plug Spark Tester 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