Hygro Thermometer Psychrometer, 0 to 100 Percent Relative Humidity Range, +/-3 Percent Humidity Accuracy, Air -4 Degrees to 122 Degrees F/ Probe -4 Degrees to 158 Degrees F Temp. Range (F), +/-1.8 Degrees F Temp. Accuracy (F), -6.9 Degrees to 122...