Lisle Inline Spark Plug Tester — Double-Ended, Visual Check, Model# 20610

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- 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
- Tool is double-ended to offer a straight boot and a 90 degree boot on one tool
- With the engine running, the tool flashes a mirror image of ignition spark
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