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Masons Hygrometer Wet & Dry Bulb C&F - Simple form of psychrometer to provide easy way to measure the amount of water vapour in the atmosphere, on a percentage scale known as Relative Humidity (%RH). The difference between the "wet" and "dry" bulb temperature enables the %RH to be determined through the use of the table and calculate. The classic masons hygrometer pattern wet and dry bulb with a large water reservoir. One thermometer bulb is in air and the other is wrapped in a wick kept moist from a water resevoir. Complete with wet and dry bulb tables. C&F