Room temperature sensor THERMASGARD® RTF 1 with passive output, in an elegant enclosure made of plastic, with snap-on lid, base with 4-hole attachment, for installation on vertically or horizontally installed flush-mounted boxes, with predetermined breaking point for on-wall cable entry or in enclosure made of stainless steel (top and bottom parts are stainless steel, the cover is screwed on), vandal-proof version e.g. for schools, barracks and public buildings. This residential room temperature sensor is used to detect / display temperatures in closed, dry rooms, in apartments, in cinemas, supermarkets, storage rooms, office and business facilities.