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Sling Psychrometers are used to measure the air and wet bulb temperatures, in order to determine the relative humidity and dew point temperature. The Bacharach sling psychrometer is a portable, plastic, self-contained, hand-held psychrometer containing two bulb thermometers, a cotton wick and a water reservoir for automatic wick wetting. The bulb thermometers are filled with red spirit. A built-in slide rule reveals relative humidity at a glance. The range of thermometers is 30-110°F. Accuracy of the thermometers is +/- 1°F. The instrument conforms to ASTM E 337. Made in the USA.
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