Welcome to our shop Here is the description of our automotive spark plug tester: - The frequency is adjustable, allowing detection of different firepower settings in various working conditions. - The bypass detection table has been redesigned, with the bypass hole positioned away from the adjustable button for improved safety during use. - Equipped with 3 indicator lights, the tester can detect incoming signals and accurately determine if there is a malfunction in the ignition system or spark plug. - It can assess the quality of the spark plug by evaluating spark straightness and identifying intermittent issues. - The tester can also determine the level of aging in a spark plug, with bright purples indicating good condition and dark reds suggesting significant aging. - Different brands and specifications of spark plugs can be evaluated for strong flashover and loud sound under the same signal. - The tester operates on a standard power supply, ensuring stable flashover and durability. - Comes with a European standard adapter for convenient use. Automotive spark plug test principle: In the car ignition system, the high voltage generated by the ignition coil (over 10000 volts) is transferred by the spark plug to the engine cylinder, where the spark ignites the mixture. The spark strength can be used to distinguish between good and bad spark plugs. Precautions for using the automotive spark plug tester: 1. Always turn off the power before inserting or removing the spark plug. 2. The spark plug tester is a high voltage detector. Do not touch the spark plug with your hands during operation to avoid any potential danger. Remember, your satisfaction is our top priority. If you encounter any issues with the product, such as damages or incorrect quantities, please contact us immediately. We strive to provide you with excellent after-sales service. Thank you for choosing our automotive spark plug tester