Brunton Sherpa Atmospheric Data Center, Blue (Discontinued by Manufacturer) Handheld atmospheric data center with built-in altimeter, barometer, and thermometer Finely calibrated wind meter calculates wind speed in mph, knots, Beaufort, km/h, or m/s Altimeter determines altitude in meters or feet (up to 30,000 feet); large LCD display Barometer measures minute changes in atmospheric pressure in mercury inches or mm Rugged ABS plastic housing; measures 1.57 x 3.93 x 0.70 inches (W x H x D); 2-year warranty