Seller notes

Spark Plug Tester Dual Hole Diagnostic Tool 12V Gasoline Car Ignition AnalyzerProduct Usage: 1.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 2.2.Connect to power supply.3.Turn the key switch 4 clockwise to turn on tester, indicator 3 will light up, tester is now working at 1000rpm/min.4.Again turn the key switch 4 clockwise,you can adjust the working frequency between 1000rpm to 6000r...

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