Textile Adviser: Wet and dry bulb hygrometer (a simple instrument for relative humidity test)
Wet-bulb temperature - Wikipedia
Wet and Dry Bulb Thermometer - Meteorology, Physics Supplies
Wet Dry Bulb Hygrometer at Thomas Scientific
THE LABWORLD Labworld wet and dry bulb thermometer hygrometer humidity meter instrument wall mounted wooden base for home,workspace and Godawns,28 cm long Thermometer with Fork Kitchen Thermometer Price in India - Buy