1. 
   Thermo-hygrograph
   A Thermo-Hygrograph is a chart recorder that measures and records both temperature and humidity (or dew point). Similar devices that record only one parameter are a thermograph for temperature and hygrograph for humidity. A thermograph is usually configured with a pen that records temperature on a ...
   Found op http://en.wikipedia.org/wiki/Thermo-hygrograph
   
   
2. 
   Thermohygrograph
   An instrument for measuring humidity and temperature.Used extensively in museums, libraries and where the temperature and humidity need to be monitored to ensure that items are kept in the optimum conditions. See also: Humidity, Temperature.
   Found op http://www.diracdelta.co.uk/science/source/t/h/thermohygrograph/source.html
   
   
3. 
   Thermohygrograph
   (F Thermohygrographe) Device that measures and records simultaneously air temperature and relative humidity (BS 5643)
   Found op http://www.angelfire.com/biz/BuildingPathology/BldngPathGlsry.html
   
   

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