Check the listing for details. AUTOOL Car Spark Plug Tester Dual Hole Ignition Diagnostic Tool Adjustable 12V. Condition: New. Listed at 49.99 USD. AUTOOL SPT301 Spark Plug Tester is a professional automotive repair tool designed with 3 test holes, easy to carry and use. The height of the test holes can be adjusted, and the spark plug end is relatively long can also be used. It can be used to determine whether the spark plugs are working properly or need to be replaced by intuitive LED indicator to show the jumping of the spark plugs, which is an indispensable and practical tool for automotive repair workThree-Hole DesignSimulate Engine Comparative TestingAdjustment Digital Display Safety CoverAUTOOL always selects long-lasting and durable product materials, adheres to the production process of excellence, and upholds the spirit of revolution and innovation, committing to creating products with innovative and superior quality for users.Why Choose AUTOOL?Premium Tough Quality3 Year WarrantyFast & Secure Delivery30-Day Free Returns24/7 Attentive Service Why Choose AUTOOL SPT301 Automotive Spark Plug Tester?AUTOOL SPT301 Spark Plug Tester is a powerful automotive maintenance tool that combines accurate detection, ease of use, time efficiency, versatility, durability, cost effectiveness and environmental protection. The AUTOOL SPT301 Spark Plug Tester can quickly and accurately diagnose the working condition of spark plugs, helping you to optimise the performance of your car and improve the driving experience, while reducing unnecessary maintenance costs and environmental impact, making it the perfect choice for improving maintenance efficiency and ensuring the reliability of your vehicle.Simulated RPM Test This function simulates the operation of the spark plug during engine operation, providing an adjustable simulated RPM. The operating frequency is in the range of 200~9000rpm Safety cover Before performing the test, the user can simply close the protective cover to effectively prevent sparks from harming the individual, giving the user more peace of mind during the testing process.Three-hole design With the ability to test three spark plugs simultaneously and a test diameter of 12mm, it can be used to test 12V automotive spark plugs and is widely compatible with 99% of crankshaft engine and motorcycle spark plugs on the market.Digital screen display The high-definition digital screen provides users with an intuitive way of displaying data, clearly displays analog engine speed, improves control accuracy, and makes it easy for users to read and analyze test results.Comparative testsing The 3-hole spark plug tester supports the comparison test function, users can test 3 spark plugs at the same time, i.e. 1 new spark plug and 2 old spark plugs, through the intuitive comparison results, users can quickly determine the difference in the performance of the spark plugs, so that the test results are more direct Adjustable Test Hole HeightFit For BMW, Volkswagen, Audi and other models, the spark plug end is longer can also be used, the scope of application is wider, a device can handle your spark plug test work, efficient and convenient.Operation Procedure Step 1：Insert the normal spark plug into the designated hole position & the test spark plugs into the assigned test holes. Step 2： Prior to testing, ensure the protective cover is securely in place. Step 3： Connect the power cord and turn on the switch Step 4： Adjust the simulated RPM and observethe spark plug's performance. Please Note 1. Before placing the spark plug, please turn off the power (this is the most important, please make sure your safety first) 2. Spark Plug Tester is a high voltage tester, so do not touch the spark plug with your hands while working to avoid danger.Product SpecificationsInput Power：AC 110V ±10% Output Power:DC12V ±2 1A Simulated RPM:200-9000RPM Ambient Temperature:0℃-45℃ Relative Humidity: