Adjustable Dual Hole Car Spark Plug Tester Spark Plug Detector 12V Gasoline Vehicles Spark Plug Test Diagnostic Tools

Features1. Car Spark Plug Tester Detector with Dual Hole Advantage: Dual Hole Car Spark Plug Tester Detector have two testing holes you can test two spark plugs meanwhile and and if you suspect any spark plug works improperly you could compare and test to make accurate judgment. 2. Usage: Test spark plug performance and ignition strength. 3. Application Range: 12V Gasoline vehicles car spark plugs.Principle:1. In automobile ignition system the high-voltage ignition coil generates a high-voltage (10000 volts or more) and the spark plug diverts it form. 2. High-tension ignition coil into the cylinder engine spark between the spark plug electrodes will ignite the mixture. The Detector could tell the good spark plugs from the bad by the strength of the spark.Using Note:1. Please Turn Off Power before you place spark plug. 2. The Spark Plug Tester is a high-voltage detector so do not touch spark plug with hand at work to avoid danger.User Manual:1. Place the Spark Plug into tester hol