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:Condition: 100% Brand NewMaterial: Plastic + MetalPlug: US PlugVoltage: 100-240VFitness: for Ford Toyota General Holden Patrol ZD30 D40 D4D 4WD Turbo Charge DieselWeight: Approx. 350gPackage List:1 x Tester1 x User Manual1 x Power Adapter1 x Plug