1.[Simultaneous Dual-hole Testing]The spark plug tester has two test holes, which can test the spark plug at the same time. By comparing the intensity of the test spark, you can make an accurate judgment on the quality of the spark plug, saving time and efficiency, and ensuring the spark plug can work properly. 2.[Working Frequency from 0 to 6000rpm]The working principle of the car spark plug tester is by simulating the engine work, the working frequency of the tester can be adjusted according to the need, and the range can reach 0 to 6000rpm, the higher the set frequency, the stronger the spark intensity. 3.[Plug-and-Play & High Voltage Indicator]Put the spark plug in the test hole, close the protective cover, connect the power supply and adjust the working frequency. The automotive spark plug tester is equipped with a high pressure indicator light, you can easily observe the spark plug test status. 4.[ABS Material & Protective Cover Design]The spark tester is made of ABS material, which is moisture-proof, high-temperature resistant, impact resistant and has a longer life. Cover the protective cover before use, the test process can ensure the operator's , but also through the transparent protective cover to visually observe the test results.