Sealey TST22 12v 13 Pin Towing Socket Tester

The Sealey TST22 is a DVSA-approved towing socket tester designed for professional testing of 12V 13-pin Euro-type sockets on vehicle classes 4, 5 and 7. This diagnostic tool provides quick and reliable testing of trailer electrical connections, making it essential for MOT testing stations and workshops that service vehicles with towing equipment. Powered directly from the vehicle's 12V supply, the TST22 features a generous 4.9m cable that allows the operator to conduct tests from inside the vehicle cab for convenient single-person operation. The integrated self-test facility ensures the tool itself remains serviceable and accurate, providing confidence in diagnostic results. Beyond standard MOT requirements, this tester also checks 12V continuous and ignition live feeds plus reversing lights, making it invaluable for diagnosing electrical faults in towing systems. The versatility of this tester is enhanced by the included 13 to 7-pin adaptor, enabling technicians to test older wiring systems alongside modern installations. This makes it ideal for garages and testing stations working with a mixed vehicle fleet, from newer caravans and trailers with 13-pin connections to older systems still using 7-pin configurations.