Kestrel Meter 4400 Heat Stress Meter (DISCONTINUED)
Kestrel Meter 4400 Heat Stress Meter (DISCONTINUED) - No Bluetooth Model
Outdoor Wet Bulb Globe Temperature (WBGT)
Measure of human heat stress defined as the combination of effects due to radiation, convection, and conduction. Outdoor WBGT is calculated from a weighted sum of natural wet bulb (Tnwb), globe temperature (Tg), and dry bulb temperature (Td). User settable on-screen warning zones.
Thermal Work Limit (TWL)
Estimated safe maximum continuously sustainable human metabolic rate (W/m2) for the conditions and clothing factors. Based off of estimated metabolic output of typical human. On-screen zone warnings.
- Thermal Work Limit (TWL)
- Wet Bulb Globe Temperature (WBGT)
- Naturally aspirated Wet Bulb Temperature
- Wind speed
- Max wind gust
- Average wind speed
- Wind chill
- Relative humidity
- Heat stress index
- Dew point temperature
- Wet bulb temperature
- Barometric pressure
- Density altitude
- Pressure trend
The Kestrel 4000 is waterproof, able to float and includes an easy to read backlit display that shows the minimum, maximum and average values for every measure. The automatic or manual data logging features makes it easy to store, recall, and graph data sets and customizable user screens allow users to group key measurements. Data can be easily uploaded to a computer with an optional interface, allowing for easy storage and analysis of data for later use.
In addition to being easy to use, the Kestrel 4400 was also designed to be highly durable in the field. The Kestrel 4400 features external temperature and humidity sensors for fast and accurate readings, and a patented “no-tools replaceable” wide-range air flow impeller that instantly restores the meter back to it’s factory calibration. The meter was designed with a flip-top impeller cover that allows for the use of other functions while protecting the impeller. The meter was built with a highly stable humidity sensor that rarely requires calibration.
Why Use WBGT as a Heat Stress Indicator vs. just using the Heat Index?
Wet bulb globe temperature (WBGT) is based on an equation that uses a combination of environmental elements to calculate the reading. The calculation is a measure of the heat stress in direct sunlight, which takes into account: temperature, humidity, wind speed, sun angle and cloud cover (solar radiation).
Heat index takes into consideration temperature and humidity, and is calculated for shady areas.
Customized Warning Zones
Users from different work environments or different standards around the world have the ability to create their own warnings on the Kestrel 4400. With the user friendly functionality, the user may go into the Kestrel 4400's WBGT function and turn different warning zones on or off and set these warning zones to be triggered at different degrees as the temperature rises. By customizing the Kestrel 4400's WBGT warning zones, monitoring a team or crew becomes much more personal. A chart with suggested warning zones will be included with every Kestrel 4400 ordered.
The Kestrel 4400 includes:
- Protective carry case
- Kestrel Vane Mount
- 2 AAA batteries
- Kestrel Certificate of Conformity
- 4400 HST (Heat Stress Tactical) are Berry Compliant with Vane Mount MOLLE Carry case.
It’s can be used in five different languages, including English, French, Spanish, German and Italian.
Kestrel 4400 Heat Stress Tracker Videos
Kestrel Meter Heat Index Reference Guide
Download Heat Index Reference Guide - Download Now (PDF)
Kestrel Meter 4400 Additional Information
- Kestrel Meter 4400 Heat Stress Meter Detailed Specs.
- Kestrel 4400 Instructions (PDF)
- Kestrel Meters Catalog (PDF)
- Dimensions: 16.5 x 5.9 x 2.8 cm
- Weight: 125 Grams
- Place of Origin: USA
*We ship every Kestrel 4000 Series Meter exclusively with Made in the USA Energizer® Brand Ultimate Lithium AAA batteries for improved reliability, capacity, cold-weather performance and weight. We strongly recommend that you use only Energizer Ultimate Lithium batteries in your Kestrel Meter. If you choose to install alkaline batteries, we recommend that you do NOT store your Kestrel with these batteries installed, and that you check your batteries for leakage and corrosion a minimum of every 30 days. Damage due to leaking alkaline batteries is not covered under warranty.