Connect the tool between the spark plug and the plug wire. With the engine running, the tool flashes a mirrorimage of the ignition spark.
Lisle Tools 20610 - Inline Spark Tester (One Size Factory)
Lisle 20580 InLine Spark Tester w/ Coil On Plug Wire
Lisle 20610 Inline Spark Tester, Double Ended Straight Boot and 90 Degree Boot
Lisle Corporation 20610 Inline Spark Tester, 90 Deg. Or Straight
Lisle Tools Inline Spark Tester - Coil-On-Plug/Standard Ignition
