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Cal-Hawk Inline Ignition /Spark plug tester. 6v to 12v. Great for check engine light (random misfire/multiple misfire codes. Easily find the bad plug and replace instead of entire plug and wire set. Saves $$$$.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.