REED Instruments 8706 Digital Psychrometer/Thermo-Hygrometer, (Wet Bulb, Dew Point, Temperature, Humidity)

Temperature Measuring Range: -4 to 158°F (-20 to 70°C) Dew Point Measuring Range: -109 to 122°F (-78 to 50°C) Wet Bulb Measuring Range: -69 to 122°F (-21 to 50°C) Dimensions: 7 x 1.9 x 1" (179 x 48 x 25mm) Operating Humidity Range: 10-80%