Kestrel 5400 Heat Stress Tracker - D

As for weather reading features, they will be the same. You won't get a 'better' temperature reading, wind reading, etc, or even more readings than available on the 4400/4600... still the same quality USA made meter backed by a 5 year warranty. That being said there are some pretty outstanding updates.

• Flag warnings via loud buzzer & LED beacon!
• Takes 1 AA battery (instead of 2 AAA)
• Battery door is in the back, sealed away from the motherboard, should your battery leak as was common with all the 4000 series. All 5000 battery doors are the same and interchangeable.
• Slightly larger and improved higher contrast / resolution screen for any lighting (even sunlight) and easy on your eyes.
• Intuitive user-interface screen navigation
• Multiple Languages (English, French, German, Spanish)
• Scratch and breakage-resistant window
• Slightly bigger, more robust, though not really noticeable difference.
• Roughly 10,000 data points. 4000 series all had under 5000 data points.
• The Kestrel 5400 is revolutionary in size, cost and capability for those in need of measuring Heat Stress. Available with or without LiNK (Bluetooth) and / or a compass.

Along with having a Wet Bulb Global Temperature reading, the Kestrel 5400 displays thermal work limit (“TWL”), another recognized composite heat stress prediction tool. For both WBGT and TWL, the Kestrel 5400 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 5400 particularly useful in activities requiring heavy protective gear which worsens heat stress. The Kestrel 5400 also displays natural wet bulb temperature, and black globe temperature.