Being a simplified hygrometer, the psychrometers measure the relative air humidity by comparing the readings of two temperatures. One temperature reading is taken exposed to the open air while the other is submerged in a liquid. The difference in temperature between the dry and wet bulbs, the psychrometer determines relative humidity when used in conjunction with a chart or slide rule. Advantages include the simple design of the instrument, economical savings, and portability.
Taylor Sling Psychrometer
Obtain quick and accurate wet and dry-bulb temperatures with this handy instrument.
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Sling Psychrometers, Celsius/Fahrenheit, Sper Scientific
Obtain fast and accurate humidity readings anywhere by comparing the reading of the wet and dry bulb thermometers on the enclosed humidity chart. Eliminates the hazard of splattering mercury by using a safe and easy to read red liquid. The thermometers are recessed into a protective plastic mounting. The mounting also contains a water reservoir eliminating the need to constantly rewet the wick.
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Compact Sling Psychrometers
Measure relative humidity with weather bureau-type wet and dry bulb thermometers. Pocket-sized psychrometer is perfect for student use, as it presents no mercury hazards.