Wet Bulb Thermometer

Comparing wet and dry bulb thermometers is the most accurate, low cost method
for measuring Relative Humidity. Simple, direct reading hygrometers are available
but vary widely in accuracy and are not recommended. The Brinsea wet bulb thermometer
is specifically designed for use with the Octagon 20 and 40 and comes with conversion
chart showing Relative Humidity. For automatic humidity control please see the
H22 Humidity Management Module.