Hygro-Thermometer Datalogger with NIST Temperature and Humidity Temp Range (F) -40 Degrees to 158 Degrees F Relative Humidity Range 0 Percent to 100 Percent Pressure Range Not Applicable Dew Point Range Not Applicable Accuracy +/-1.8 Degrees F (1.0 Degrees C) +/-3.5 Percent Time Intervals 2 sec to 24 hr Software Required Analysis Software Interface USB Calibration Certificate Yes Includes 3.6V Battery Analysis Software