Brunton ADC Pro
"The most comprehensive data center available to backcountry explorers and outdoor professionals. Measures, counts, tracks, interprets, forecasts and logs virtually every aspect of your trip. Features: current temp, wind speed, wind chill, water speed, time and date, timer, chronograph, humidity, air density, heat index, dew point, altitude, & barometer. Dimensions: 4.3"" x 2"" x 0.8"". Wt: 2.4 oz. "