Double-hole testing and time saving: The car spark plug tester is for double-hole simultaneous testing as well as analog engine operation, which is much more efficient and time saving. 0 to 6000 rpm operating frequency: The car spark plug tester is designed with adjustable operating frequency, the range can reach 0 to 6000 rpm. Can be adjusted as needed. Wide range of applications: 12V gasoline vehicle car spark plug, 100V-240V input voltage. Easy to use Plug and Play: Easy to use, plug and play. Comes with indicator light, the status of the spark plug can be displayed more intuitively. Spark plug tester with spark gap: The tester can show whether there is ignition voltage and its intensity. Unlike spark plugs, spark gap can be tested on this tool. So you can check the power reserve. You can adjust the spark gap by turning the adjusting screw. A good and intact ignition system should have a gap of at least 15 mm. Item Name: Car Spark Plug Tester Analog Speed: 0-6000rpm Operation Steps: 1. Place the spark plug into the test hole. 2. Cover the protective cover. 3. Connect the power supply, adjust the working frequency. 4. Observe the test status of the spark plug through the protective cover. Advantage of Spark Plug Tester: Determine the quality of the coil based on the color of and the flashes at a distance Intuitive and easy to understand the function of the ignition coil Crocodile clip is securely attached to the ground Screw mounting allows for quick and easy adjustment of the spark gap Avoid fire, burnout of ignition coil, etc. Tips: The product can be updated constantly, due to different batches, the actual product may have slight differences or color differences, which does not affect the use Plug Type: EU plug, it is applicable to Indonesia, Germany, France, Italy and so on. Voltage: AC100-240V Color: Red Material: Plastic Package Contents: 1 x Auto Spark Plug Tester Pen Only the above package contents, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.