Kestrel 4400 Heat Stress Tracker
Along with having a Wet Bulb Global Temperature reading, the Kestrel 4400 displays thermal work limit (“TWL”), another recognized composite heat stress prediction tool. For both WBGT and TWL, the Kestrel 4400 provides on-screen alarms when conditions enter the caution and danger zones, providing clear and immediate guidance that heat illness prevention steps must be taken. Clothing levels can also be customized, making the Kestrel 4400 particularly useful in activities requiring heavy protective gear, which worsens heat stress. The Kestrel 4400 also displays natural wet bulb temperature and black globe temperature.