Extech RHT3 EzSmart Hygro-Thermometer Measures Humidity and Temperature simultaneously Calculates Wet Bulb and Dew Point Temperature Continuous graph plots Humidity and Temperature changes over time 5 user-settable high/low alarms for both Temperature and Humidity 4 records - each contains 100 data points with Humidity, Temperature, Wet Bulb and Dew Point, plus Time, Date and GPS coordinates