{"product_id":"thexton-the404-spark-tester-compact-ignition-diagnostic-tool-inline-spark-check-portable-glovebox-size","title":"Thexton THE404 Spark Tester — compact ignition diagnostic tool, inline spark check, portable glovebox size","description":"\u003cp\u003e\u003cstrong\u003eThexton THE404 Spark Tester is a compact ignition diagnostic tool designed to check spark presence quickly and safely on gasoline engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSmall enough to keep in a glovebox or toolbox, the THE404 spark tester offers a simple way to verify whether a ignition coil, spark plug lead or ignition system is producing a visible and reliable spark. Built as an automotive accessory, it helps technicians and DIYers narrow down ignition faults without removing spark plugs or using large equipment.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the THE404 tell me if there’s a spark problem?\u003c\/h3\u003e\n\u003cp\u003eThe tester creates a controllable gap that allows you to observe a spark in a safe, visible location, rather than relying on indirect symptoms. By connecting the tester inline with a spark plug lead or coil output, you can watch for a consistent spark and judge ignition performance quickly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnects between coil\/lead and plug to reveal a visible spark.\u003c\/li\u003e\n  \u003cli\u003eProvides immediate visual confirmation of ignition output.\u003c\/li\u003e\n  \u003cli\u003eHelps separate electrical ignition faults from fuel or mechanical issues.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the THE404’s size and portability benefits?\u003c\/h3\u003e\n\u003cp\u003eThexton designed this unit to be compact and lightweight so it fits easily in workshops and mobile toolkits. Its small packaged dimensions make it convenient to store and transport, which is useful for service vehicles and roadside checks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePackage height: 11.988 cm for a compact footprint.\u003c\/li\u003e\n  \u003cli\u003ePackage length: 3.378 cm for narrow storage spaces.\u003c\/li\u003e\n  \u003cli\u003ePackage width: 8.483 cm for easy mobility and low bulk.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use the THE404 safely during diagnostics?\u003c\/h3\u003e\n\u003cp\u003eFollow basic ignition-safety practices: engine off when connecting, use insulated gloves when needed, and keep hands and conductive objects away from exposed live parts while cranking. The tester’s design keeps the observation point isolated from direct contact to reduce risk when used correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAttach to spark lead or coil as instructed — do not touch live terminals.\u003c\/li\u003e\n  \u003cli\u003eObserve spark from a short, safe distance; avoid metal-to-metal contact.\u003c\/li\u003e\n  \u003cli\u003eDisconnect before performing repairs or high-voltage work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this tool replace a full ignition diagnostic kit?\u003c\/h3\u003e\n\u003cp\u003eWhile the THE404 quickly confirms whether spark is present, it is not a substitute for in-depth diagnostics that measure timing, coil primary resistance, or electronic control outputs. Use it as a first-line check to identify whether further testing with specialized meters or scan tools is necessary.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for initial troubleshooting and rapid fault isolation.\u003c\/li\u003e\n  \u003cli\u003eComplements multimeters and oscilloscope testing when deeper analysis is needed.\u003c\/li\u003e\n  \u003cli\u003eSimple operation reduces time spent on initial diagnosis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Thexton THE404 Spark Tester is aimed at professional mechanics, mobile technicians, and car owners who want a fast, portable way to confirm ignition spark during routine servicing or troubleshooting. It suits anyone who needs a compact, easy-to-use accessory to help decide whether an engine’s ignition system is producing a visible spark before committing to more extensive repairs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the THE404 test all spark plug types?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it checks spark presence on typical gasoline ignition systems; follow connector fit instructions for different lead types.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the tester safe to use on a running engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use caution: connect with engine off and crank as directed; avoid touching live terminals while testing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Thexton","offers":[{"title":"Default Title","offer_id":55166100406615,"sku":"B0002STSBM","price":36.36,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/thexton-the404-front-view.jpg?v=1790362912","url":"https:\/\/britishgarage.co.uk\/products\/thexton-the404-spark-tester-compact-ignition-diagnostic-tool-inline-spark-check-portable-glovebox-size","provider":"British Garage","version":"1.0","type":"link"}