The hygrostat type HG80 serves as a two-point controller to regulate the relative humidity in air ducts of the air conditioning systems, climatic cabinets, to regulate the air humidification and dehumidification. Further areas of application are the storage of food and beverages, cold rooms for fruit and vegetables, greenhouses in horticulture, textile industry, paper and printing industry, film industry, hospitals. The HG80 hygrostat can usually be used wherever humidity has to be regulated or monitored.