Psychrometer Temperature and Humidity 0.1 Percent to 99.99 Percent Relative Humidity Range +/-3 Percent Humidity Accuracy -4 Degrees to 122 Degrees Temp Range (F) +/-1 Degrees Temp Accuracy (F) 5 Degrees to 121.8 Degrees F Wet Bulb Temperature Range 4.0 Degrees to 121.8 Degrees F/-20.0 Degrees to 49.9 Degrees C Dew Point Range 0 to 99 Percent Absolute Humidity Range 15 Degrees to 120 Degrees Surface Temp (F) 0.001 Percent Humidity Resolution