Reed Instruments 8726 Digital Psychrometer and Data Logger

Measures relative humidity, air temperature plus external probe temperature and quickly calculates wet bulb and dew point temperatures. Simultaneous display of percent RH, air temperature and dew point or wet bulb or external probe temperature in degree F or degree C. Max/min/avg readings and data hold. A built-in datalogger that stores up to 99 data points; a real time clock; and an infrared output for wireless printing. Humidity range: 0 to 100 percent RH. Resolution: 0.1 percent RH. Accuracy: +/-3 percent RH. Internal temperature range: -4 to 122 degree F. External temperature range: -4 to 158 degree F. Resolution: 0.1 degree F/ degree C. Accuracy: +/-1 degree F. Dew point range: -109.7 to 122 degree F. Wet bulb range: -6.9 to 122 degree F. Resolution: 0.1 degree F/ degree C. Accuracy: +/-3 percent f.s. Power Supply: 4 x 1.5V "AAA" batteries. Measures 9" length by 2-3/32" width by 1-51/64" depth.