This in-line ignition spark checker is a must-have for any car enthusiast. It allows you to quickly and easily check the spark of your engine without having to remove any components. Simply attach it between the plug and wire to see if there is a strong spark. With its compact size and easy-to-use design, this tester is perfect for both professional mechanics and DIY enthusiasts. The brand of this spark plug tester is Harbor Freight Tools and its manufacturer part number is 04424. This diagnostic service tool falls under the category of eBay Motors and Automotive Tools & Supplies. Ignition testers are a crucial part of any car maintenance toolkit, and this new in-line spark checker is a reliable and efficient addition.