4600 Heat Stress Tracker - YellowCarry one tool - Get all the functions you need.The Kestrel 4600 Heat Stress 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.Features: 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 WarrantyMeasures: 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 Wind YesWireless Yes