Air temperature-humidity recorder -Thermo-Hygrograph - for continuous recording of relative humidity and air temperature

A thermo-hygrograph (also thermo-hygrograph) is a combined recording device for simultaneously measuring and recording the air temperature and relative humidity during a certain period of time. The individual devices are the thermograph and the hygrograph. Thermohygrographs are mainly used in meteorology as part of weather stations, but are also used in museums, building services, storage and transport, as well as in construction (e.g. building repair and sealing). A meteorograph is an extension with a barograph.
Classic models are realised as drum recorders with bimetal, natural hair and mechanical or electronic clockwork, whereby the drum can have a circulation time of one, seven, 14 or 31 days. The measured values are recorded on paper as measurement curves.