13 pin towing socket tester 12v vosa approved sealey tst22 vosa approved for use in mot testing stations on vehicle classes 4 5 and 7 quick and simple test of 12v 13 pin euro type sockets fitted to the rear of the vehicle supplied with 4 9mtr cable to enable the operator to use the tool whilst sitting in the vehicle features self test facility to ensure the serviceability of the tool powered by 12v vehicle supply also tests the 12v continuous live feed 12v ignition live feed and the