This is a small conveniently sized, resealable clamshell holding 3 existing items of model numbers 7897, 8022 and 8030. This is the perfect solution for maintaining and repairing 6 pin truck and trailer connectors. The tester can be used to verify continuity and wiring configuration. The cleaner is designed to precisely remove pin corrosion and resize the pin to its factory specs. The DeoxIT is a patented solution for breaking the bonds of microscopic corrosion and improving pin mating surfaces.