Feature:1. Double Hole Design: Spark plug tester has two spark plug socket, you could compare and test to make an accurate judgment at the same time.2. Time Saving and Efficient: The working principle of the car spark plug tester is to test the performance of the spark plug by simulating the work of the engine.3. Protective Cover: The protective cover can prevent you from the risk of electric shock during the test,which effectively guarantees your safety during the operation.4. Practical Tool: Adjustable frequency of 500rpm6000rpm. If you suspect that any of the spark plugs are not working properly, you can conduct comparative tests to make an accurate judgment.5. Application: Easy to operate, plug and play. Built in indicator light for more intuitive display of status. Suitable for spark plugs of most 12V gasoline cars.Specification:Item Type: Car Spark Plug TesterMaterial: Metal, ABS.Usage: Test spark plug performance and ignition strengthPower Adapter: Input 100-240VAC, Output 12V 1A DCPlug: EU Plug 100240V Wide voltageApplication:Applicable for 12V Gasoline VehiclesPackage List:1 xCar Spark Plug Tester1 x Charger1 x ManualNote:1. Turn off the power before placing the spark plug 2. The spark plug tester is a high pressure detector, please do not touch the spark plug with your hands when working, so as to avoid danger