Dual Hole Testing and Time Saving: The Car Spark Plug Tester is 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. Ignition spark tester with spark-gap: The tester can show if there is ignition voltage and its intensity. In contrast to spark plugs, spark-gaps can be tested on this tool. So you can check the power reserve. You can adjust the spark-gap by turning the adjustable screw. A good and intact ignition system should have a clearance of at least 15 mm. Item Name:Car Spark Plug Tester Analog Speed:0-6000rpm 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. Advantage of ignition spark tester: Determine the quality of the coil based on the color of the and the flashes in the distance Intuitive and easy to understand the operation of the ignition coil Alligator clip securely fixed to the ground Screw assembly allows quick and easy adjustment of spark-gap Avoid fire, burnout of ignition coil, etc. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan,the , the Philippines and so on. Voltage:AC100-240V Colour:Red Material:Plastic Package Contents: 1 x Auto Spark Plug Test Pen Only the above package content, 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 1-3cm.