Feature:1. DOUBLE HOLE TEST: This car spark plug tester has two test holes, which can carry out double hole test at the same time. By comparing the strength of the test spark, the quality of the spark plug can be accurately judged, and the spark plug can work normally2. ADJUSTABLE FREQUENCY: 10006000rpm working frequency, the working frequency of the car spark plug tester is adjustable, the higher the set frequency, the stronger the spark strength, which can be adjusted as needed3. LIGHT INDICATION: Turn the engine, if the ignition is sent to the cylinder, the lights in the tester will glow, saving time and frustration with cars, motorcycles, boats, chainsaws, lawn mowers, etc.4. EASY TO OBSERVE: Put the spark plug into the test hole, connect the power supply and adjust the working frequency, and equipped with a high voltage indicator light, you can easily observe the test status of the spark plug5. EFFICIENT AND ACCURATE: The working principle of the automobile spark plug tester is to test the performance of the spark plug by simulating the work of the engine, which is more time saving and efficient. Spark plugs for most 12V petrol vehiclesSpecification:Item Type: Spark Plug TesterMaterial: ABSWorking Frequency: 1000-6000rpm.Package List:1 x Spark Plug Tester1 x ChargerNote:This spark plug tester is specially designed for testing car engine spark plugs. Not suitable for short plugs for testing lawn mowers, chainsaws, or most small motors.