Amazon is selling this Blackhawk Tools Spark Test Screwdriver for $6.12. You test your spark plugs by bringing the screwdriver close to the wire while the engine’s running and seeing if the neon bulb glows.
Via Amazon [What’s This?]
Street Pricing [Google]
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One Response to Dealmonger: Spark Plug Testing Screwdriver $6
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You can always pull the wire and stick and screwdriver in the end(and near ground unless you want to be the ground) but to be fair I have a similar thing with a clip that goes to ground and a little probe.
http://www.lislecorp.com/tool_detail.cfm?detail=381