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Adjustable dual-hole automotive spark plug tester tester spark plug analyser diagnostic tool. Turn the tester on by turning the key switch 4 clockwise, the indicator light 3 will illuminate and the tester will now operate at 1000 rpm.
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.