The trailer's socket testers (13-pins and 7-pins) allows to check operation of installed towbar kits.
Universal tester TMP02-G7G13 allows to verify properlies operation of installed towbar kits (any producer) with socket G13 or G7.
Universal wireless tester TMP02-G7G13 allows to verify properlies operation of installed towbar kits (any producer) with socket G13 or (using adapter) G7.