Temperature Humidity Data Logger, AC Voltage Accuracy Not Applicable, Alert Type Light, Current Channels Not Applicable, Maximum Dew Point Measured 176 Degrees F, Minimum Dew Point Measured -31 Degrees F, Calibration Certificate Type Available Separately, Maximum AC Current Measurement Not Applicable, Maximum Relative Humidity Measured 100 Percent, Maximum AC Voltage Measured Not Applicable, Minimum Relative Humidity Measured 0 Percent, Minimum Operating Temperature Degrees F -31 Degrees F