1. 
   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
   
   
2. 
   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
   
   

Tip: double click on a word to show its meaning.