【Plug and Play】:Spark plug tester is very simple. Place the Spark Plug into tester hole 1 or 2; If you want to compare the new spark plug and old one, place new spark plug into hole 1 and the old on into hole 2.
Dual Hole Spark Plug Tester Diagnostic Tool 12V Gasoline Car Ignition Analyzer
1x US Plug Spark Plug Tester Diagnostic Tool 12V Car Gasoline Ignition Analyzer
