Lisle 20610 Inline Spark Tester
Brand: Lisle
Gives a Visual Check of the Ignition System.
Quickly diagnose problems with all ignition systems. Connect the tool between the spark plug and the plug wire.
The tool is double-ended to offer a straight boot and a 90boot on one tool. With the engine running, the tool flashes a mirror image of ignition spark.
Patent: 6,714,015