The Car Spark Plug Tester is for testing the performance and strength of spark plugs. The product simulates actual engine conditions and works up to 6000rpm. It is compatible with all spark plug tests for crankshaft engines and motorcycles on the market. It can also test two holes at the same time and is designed with a protective cover to ensure the safe operation of maintenance personnel during the test. [ Dual Hole Testing& Time Saving]: The Car Spark Plug Tester is able to dual-hole simultaneous testing as well as analog engine working, which is much more efficient and time-saving. [0 to 6000rpm Operating Frequency]: The Car Spark Plug Tester is designed with adjustable working frequency, the range can reach 0 to 6000rpm. Can be adjusted as you required. [Widely Application]: 12V Gasoline vehicles car spark plugs, 100V-240V input voltage . [Easy operation Plug And Play]: Easy operation, plug and play. Come with indicator light, the status of the spark plug can be displayed more intuitively. Easy to use,Operation steps: 1.Place the spark plug in the test hole. 2.Cover the protective cover. 3.Connect the power supply,asjust the working frequency. 4.Observe the spark plug test status through the protective cover. Specifications: Operating temperature: -10-20 (℃); Voltage: 12V; Power supply: 100- 240V; Main unit dimensions: 145x85x113mm; Weight: 354g; Analog speed: 0-6000rpm; Note: During the spark plug test, the voltage is high in thousands of volts. Please cover the protective cover before testing, after testing Turn the switch to the off position first, then open the protective cover Remove the spark plug. Package Included: 1 X Tester; 1 X EU / US plug.