The HM80 is manufactured by Galltec, and is a humidity-dependent switch that is suitable for use in a variety of equipment such as hygrostats, humidifiers, dehumidifiers, ventilating fans, and driers. The unit can be used with a humidity ranging from 30% RH up to 100 %RH. A variety of models with various lengths are available as a shaft. The module utilizes a perforated sensor tube for protection, and it has an ingress protection rating of 00.