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Spark Plug Tester, Dual Holes Automotive Engine Ignition Coil Tester 0 to 6000RPM Adjustable Working Frequency Car Motorcycle Spark Tester Tool for 12V Gasoline Vehicles Spark Plug Socket. If less than 12MM or the spark plug is too long, place shims on sockets before insert long spark ,can work normally.
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.