Specifications: This world patented unique trailer ball thrust scale guarantees safe driving with your mobile home/caravan/trailer. The advantage of the AM Controller is the fact that the pressure/weight from the caravan is read directly on the trailer coupling, which results in an accurate reading of the pressure/weight. Furthermore, it is possible to load the caravan/trailer while the AM Controller is mounted, which allows you to follow the weight/pressure distribution during loading. The AM Controller is avalible in both yellow and black