This Psychrometer is of sling type. It can be used to measure dry bulb temperature, Wet bulb temperature, Relative humidity and Dew point temperature. It contains two thermometers of range 0-50 ℃ in a rigid ABS plastic frame. The bulb of one thermometer is covered with cotton wick to measure Wet bulb temperature. There is a chamber which can be filled with water or alcohol to wet the cotton wick continuously while rotating the Psychrometer. This sling Psychrometer comes with instructions, Relative humidity table and a protective cover.