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 - INLINE SPARK TESTER #20610 ( NOS ) MADE IN USA‼️
Lisle 20610 Inline Spark Tester Ignition Spark Plug Diagnostic Tool New Sealed
Lisle Tools 20610 - Inline Spark Tester (One Size Factory)
Lisle 20610 Inline Spark Tester, Double Ended Straight Boot and 90 Degree Boot
Lisle 20610 Inline Spark Tester, One Size, Factory
Lisle 20610 Inline Spark Tester
