Features: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.Specifications:Item Name: Car Spark Plug TesterPower Supply100- 240VMain Unit Dimensions145x85x113mmAnalog Speed0-6000rpmOperation 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.Package Includes:1Pcs Spark Plug Tester1Pcs Power Supply Connector1Pcs User Manual