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Must-have diagnostic tool for any engine with a spark plug. Simple to use just remove rubber boot from spark plug, insert tester & place tester boot on plug. Turn the engine over if ignition is being sent to the cylinder, light in tester glows. Great time and frustration saver with cars, motorcycles, boats, chainsaws, lawn mowers & more. The spark plug base hole of 12MM, is wider to be compatible with as many spark plugs as possible.
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.