Wildland firefighters have come to rely on Kestrel weather meters for accurate, real-time information. Now you can get purpose-built fire weather models including the 3500FW, making the 3500 series even better. This handheld meter uses the best in sensor technology to provide: Altitude, barometric pressure, dew point temp, heat stress index, pressure trend, relative humidity, temperature, wet bulb temp, wind chill, wind speed, wind direction, and a digital compass. That's an awful lot in a small package.