For easy testing of the ignition spark. Is inserted between spark plug and plug connector.
Start engine and see if a spark develops in the transparent housing.
Ideal to get on the track of engine misfires and engine judder.
If the spark remains constant, you save the nerve-racking troubleshooting of the ignition.
The hands remain free during testing, so the danger of a dangerous spark is eliminated.
Simple but great diagnostic tool!
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