Ambient Weather WS-DP02 Thermometer-Hygrometer with Heat Index, Dew Point, Wet Bulb, Psychrometer Temperature and Clock The Ambient Weather WS-DP02 measures termpetature and humidity, and calculates Dew Point, Heat Index, and Wet Bulb Temperature (the same features as a digital psychrometer). The adjustable, audible warning sounds before dew point reaches critical levels. Other functions include: accurate display of actual temperature in both Fahrenheit and Celsius, as well as relative humidity and dew point. The calibration feature allows you to adjust the temperature and humidity for the upmost accuracy. The Heat Index monitor is critical for outdoor activities that involve strenuous exercise. Ideal for athletic directors and school sports.