Measures wind speed, temperature, relative humidity and wind chill. Displays wind speed in km/h, m/s, mph, fpm, knots or beaufort. Displays temperature in either Celsius or Fahrenheit. Displays humidity in % (RH). Large display with backlight. Data hold function. Waterproof, floats and includes lanyard and ergonomically designed hard cover. Patented user-replaceable impeller. Quick response external thermistor. Thermally adjusted humidity sensor. Made in USA.