Complete professional weather meter. Measures wind speed, temperature, humidity, barometric pressure, altitude, dewpoint, wet bulb temp, heat stress, density altitude and wind chill. Includes digital compass to provide wind direction, crosswind, tailwind/headwind. Auto and manual memory stores up to 10000 data points with graphical display of data. Waterproof, floats and includes lanyard and soft carry pouch. Patented user-replaceable impeller. Quick response external thermistor. Includes LiNK, which provides wireless connectivity to mobile devices via Bluetooth to display data on the Kestrel LiNK app. The LiNK version also includes a vane mount for mounting on a tripod (you don't have to purchase a vane mount if you buy the LiNK version). Use the optional tripod to turn the 5500 into a full featured weather station. Made in USA.