Check the listing for details. Inline Spark Plug Tester Tool for Automotive Small Engine Coil Wire Lawn Mower. Condition: New. Listed at 20.99 USD. US Warehouse - FREE & FAST Shipping in USA Product Description: Size:1 Pack Gives a Visual Check of the Ignition System. Quickly diagnose problems with all ignition systems. Connect the tool between the spark plug and the plug wire. The tool is double-ended to offer a straight boot and a 90 boot on one tool. With the engine running, the tool flashes a mirror image of ignition spark. Specifications: Gives a Visual Check of the Ignition System.Quickly diagnose problems with all ignition systems. Connect the tool between the spark plug and the plug wire.The tool is double-ended to offer a straight boot and a 90boot on one tool. With the engine running, the tool flashes a mirror image of ignition spark.Patent: 6,714,015 Feedback 1.Any question for your order, please contact us in time, we will reply to you within 24 hours and give you a satisfactory answer. 2.If you are satisfied with our products and services, hope to take up your little precious time to leave feedback reviews for our products.Thanks! 3. Your satisfaction is our effort. Welcome to order again! Have a great day! Our Policy 100% Satisfaction GuaranteeFree and Fast Shipping in USA, US Warehouse20% of restocking fee will be charged for returning item.