Kestrel 3500 Pocket Weather Meter reads barometric pressure, altitude, temperature, humidity, wind speed, wind chill, dew point, wet bulb, and heat indexes. Displays current, maximum, and average wind speed in meters per sec., kilometers, or miles per hr., ft. per min., knots, or Beaufort Force. Temperature, wind chill, heat stress, and dew point are shown in either C. or F. Displays relative humidity as a percentage, pressure in hPa. or in Hg., and altitude in ft. or meters. All measurements are shown on backlit display. Thermally-adjusted humidity sensor provides stable, accurate measurements even during abrupt condition changes. Other features include a real-time clock, hold function, quick response external thermistor, a high-precision pressure sensor, and a user-replaceable impeller. Housed in a waterproof body that floats, meter features a protective cover with sure-grip overmolding. Comes with lanyard andbattery.