Thermohygrographs continuously record both the temperature and the relative humidity of the atmosphere against time by drawing coloured traces onto a chart. There are two models available; the ‘standard’ and the ‘deluxe’. The Thermohygrograph standard model is the more practical instrument and is slightly more accurate on temperature.
The deluxe model is more elegant in appearance and is generally used in public areas such as receptions, public buildings, museums and libraries. Both styles are provided with a daily/weekly/monthly quartz clock, which can be set by the user.