General description Car Spark Plug Tester is designed for testing the performance and ignition strength of spark plugs. It features a dual hole testing function that allows for quick and accurate assessment by placing both a new spark plug and a used one in the testing holes. This tool effectively simulates the working conditions of the engine, providing reliable measurement results. Technical specifications Working Frequency: 0-6000 rpm Power Supply: AC 100-240V Voltage: 12V Double Hole Diameter: 13mm Measurement Allowed Error: +/- 1-3cm Compatibility and accessories Compatible with 12V gasoline vehicles and 99% of crankshaft engines and motorcycle spark plugs Package Contents: 1 x Car Spark Plug Tester, 1 x US Plug, 1 x EU Plug Adapter, 2 x Limit Gaskets Installation Plug and play design for easy setup Place the spark plug to be tested in the test hole and connect to the power supply to start the test Usage Adjustable working frequency for stronger spark intensity Power indicator