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The tester must be placed at least 5mm from anywhere in the vehicle. You can use a belt or other fixed tester. 1 X Car Spark Plug Tester. Unplug and connect it to the tester, you can put on / unplug the adapter if needed.
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.