Heat Stress Tactical Tracker, Carry one tool - Get all the functions you need. The Kestrel Heat Stress Tactical Tracker provides two vital functions in one unit. Determine appropriate exposure to heat stress conditions for occupations with heavy gear requirements, such as HAZMAT response and firefighting, AND utilize wind speed and direction for plume prediction and modeling. Carry less equipment and get more accomplished quickly in emergency situations. 1" Black Globe, User-settable WBGT warning zones, Digital Compass, Large Three-Line Graphical Display, Backlight, Wide Operating Range, High Accuracy, Patented Impeller and Sensor Technology, No-Tools User-Replaceable Impeller, Quick-Response External Temperature Sensor, Temperature-Corrected Humidity Sensor, Minimum and Maximum values, Wind Speed Average, Clock & Calendar, Customizable Automatic and Manual data Logger, On-Screen data Charting Data Upload, 5 Languages (English, French, Spanish, German, Italian), Flip-Open Impeller Cover, Waterproof & Floats, Rugged, drop-Tested, Made in the USA, 5-Year Warranty. This unit meastures: Wind Speed, Temperature, Wind Chill, Relative Humidity, Heat Stress Index, Dew Point Temp, Wet Bulb Temp, Barometric Pressure, Altitude, Density Altitude, Wind Direction, Crosswind, Headwind/Tailwind, Wet Bulb Globe Temp, Thermal Work Limit, Naturally Aspirated Wet Bulb Temp, Globe temp.