Obtain accurate readings of relative humidity without referencing charts or tables. Slide rule construction quickly converts temperature readings to relative humidity while built-in water reservoir holds sufficient water for several hours of testing without having to rewet the wick. Accurate to within ± 5% RH. Compact design (7-1/2"long x 1"diameter) can easily be carried in your pocket. Range on thermometer is 20 to 120°F.
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