Product Description： Product Usage: Simulate the performance and ignition intensity of car spark plugs using the electrical principle emitted by the car high-voltage pack. And determine the spark. Check the condition of poor quality and service life. Features: 1.Turn the tester on by turning the key switch 4 clockwise, the indicator light 3 will illuminate and the tester will now operate at 1000 rpm. 2.Turn key switch 4 clockwise again to adjust the operating frequency between 1000 rpm and 5000 rpm. The higher the frequency, the stronger the spark intensity 3. High-quality ABS material: heat-resistant and impact-resistant. 4.Adjustable dual-hole automotive spark plug tester tester spark plug analyser diagnostic tool 5.Dual hole car spark plug tester detector has two test holes, you can test two spark plugs at the same time, if you suspect that any spark plug is not working properly, you can compare and test to make an accurate judgement. Usage method: 1.When comparing the insertion of spark plugs into socket ① or ②, the new spark plug can be inserted into socket ① and the old spark plug can be inserted insert socket ②. 2. Insert the power adapter into the power connector at the back of the host, and the red indicator light will turn on. 3. After turning on the power, the green indicator light will turn on, indicating that the device is operating in 1000 rpm mode. 4. Continue rotating the knob to adjust the operating frequency between 1000 and 5000 revolutions per minute. The higher the frequency, the more intense the fire the higher the strength of the flower plug Product parameters: Power adapter: Input 100-240V AC Output 12V 1A DC. Attention: 1. Do not plug or unplug spark plugs with power on. If you want to insert or remove them, the power must be turned off. 2.When the spark plug is working, if the voltage reaches tens of thousands of volts, do not touch it with your hands to avoid damage to your body. Accessories: Host X 1 Power adapter X 1 Instruction manual X 1