Number Of Output Interface:2 Origin:Mainland China Certification:none Features: 1.Adjustable Working Frequency 2.Double Test Hole. 3.Prtoctive Cap. Specification: Frequency adjustment range: 500-6000 rpm Voltage: 100-240V Net weight: 354g Packing List: Spark plug tester *1 Note: 1.Due to the lighting effects and shooting angles,there is a color difference in the product,please understand. 2.Due to manual measurement,there is a tolerance in the product size. See more product details 1.Double-hole Spark Plug Tester: In order to see the performance of the spark plug more clearly,the spark plug tester has a double-hole test function.Simply put a brand new spark plug and the spark plug to be tested into the test holes to test the performance of the spark plug quickly and accurately. 2.Flexible Working Frequency: The working frequency of our car spark plug tester is adjustable,the range can reach 500-6000rpm.It can be adjusted as needed by turning the button. 3.Working Principle: The high-voltage ignition coil generates high voltage,the spark plug transfers the high-voltage ignition coil from the high-voltage ignition coil to the cylinder engine,and sparks are generated between the electrodes of the spark plug. 4.Safe and Durable: Made of high-quality ABS material,this spark plug tester is very stable to use,moisture-proof,high-temperature resistant,safe and durable,and can guarantee long-term use. 5.Warm Service: We hope our product would be a surprise for you.We are committed to offering excellent goods and services.If you have any questions or suggestions,please let us know.