Features: 1.Dual Hole Car Spark Plug Tester Detector have two testing holes, you can test two spark plugs meanwhile. 2.If you suspect any spark plug works improperly you could compare and test to make accurate judgment. 3.To test spark plug performance and ignition strength, apply to 12V gasoline vehicles car spark plugs. 4.The double hole of the car spark plug tester detector ignition plug analyzer diagnostic tool can be adjusted. 5.You can adjust the working frequency between 1000rpm to 5000rpm/min, the higher the frequency, the stronger the spark strength. Specification: Features:_x000D_ 1. Dual Hole Car Spark Plug Tester Detector have two testing holes, you can test two spark plugs meanwhile._x000D_ 2. If you suspect any spark plug works improperly you could compare and test to make accurate judgment._x000D_ 3. To test spark plug performance and ignition strength, apply to 12V gasoline vehicles car spark plugs._x000D_ 4. The double hole of the car spark plug tester detector ignition plug analyzer diagnostic tool can be adjusted._x000D_ 5. You can adjust the working frequency between 1000rpm to 5000rpm/min, the higher the frequency, the stronger the spark strength._x000D_ _x000D_ Specification:_x000D_ Condition: 100% Brand New_x000D_ Material: Plastic + Metal_x000D_ Plug: US Plug_x000D_ Voltage: 100-240V_x000D_ Fitness: for Ford Toyota General Holden Patrol ZD30 D40 D4D 4WD Turbo Charge Diesel_x000D_ Weight: Approx. 350g_x000D_ _x000D_ Package List:_x000D_ 1 x Tester_x000D_ 1 x User Manual_x000D_ 1 x Power Adapter_x000D_ 1 x Plug PackageList: