Feature 1Double Hole Design: Spark plug tester has two spark plug socket, you could compare and test to make an accurate judgment at the same time. 2Time 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. 3Protective Cover: The protective cover can prevent you from the risk of electric shock during the test,which effectively guarantees your safety during the operation. 4Practical 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. 5Application: 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.Item Type:CarSparkPlugTesterMaterial: Metal, ABS .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Usage: Test spark plug performance and ignition strengthPower Adapter: Input 100-240VAC, Output 12V 1A DCPlug:EUPlug100240VWide voltageApplication:Applicablefor12VGasolineVehiclesPackage List1 x CarSparkPlugTester1 x Charger1 x ManualNote1. 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