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Designed for portability. Slide rule construction quickly converts temperature to relative humidity. Built-in water reservoir holds sufficient water for several hours of testing. Thin bulb design gives fast thermal response. Non-mercury red spirit filled thermometers. Thermometers constructed of shock-resistant glass; stems have deep-etched numerals and 1" scale division for easy reading. Temperature range: 25 to 120 degree F. Accurate to within +/-5 percent RH. Ideal for measurement of comfort conditions in air conditioned environments, hospital operating rooms, storage areas and laboratories. Measures 1-1/2" diameter by 7-1/2" length. 1 Year warranty.