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【Easy to Use】: With engine off, remove rubber boot from spark plug, and simply connect the tester between the spark plug and the plug wire. If ignition spark is being sent to the cylinder, light in tester glows & mirrors the spark.
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.