About the Kestrel 5400FW Fire Weather Meter Pro

The Kestrel 5400FW Fire Weather Meter offers all the same measurements and capabilities as the standard Kestrel 5400 Heat Stress Tracker, making it ideal for athletic, occupational, and heat safety monitoring

All this while also providing powerful additional tools specifically for wildland firefighting.

Just like the 5400, the 5400FW measures and reports temperature, humidity, wind speed, and WBGT (Wet Bulb Globe Temperature) for accurate heat stress and environmental monitoring in sports, military, and industrial settings.

In addition, the 5400FW includes advanced fire-weather features such as Fine Dead Fuel Moisture (FDFM) and Probability of Ignition (PIG) — critical indices used by wildland firefighters to evaluate ignition risk and fire behavior potential in the field. The 5400FW now includes Vapor Pressure Deficit (VPD). VPD quantifies the gap between the moisture currently in the air and the maximum moisture the air can hold at saturation. This measurement reveals the atmosphere’s drying potential—one of the most important drivers of fuel moisture (FM). Because FM is fundamental to wildfire behavior and management, being able to estimate it accurately in the field—without relying on time-consuming laboratory analysis—marks a major operational advancement.

In short, the Kestrel 5400FW does everything the 5400 does — and more. It’s the perfect choice for anyone who needs reliable heat stress tracking and the added capability to assess fire weather conditions.

Features
  • Waterless WBGT accurately calculated from on-board digital sensors with no tedious setup or maintenance.
  • Large, hi-res, hi-contrast, graphic display is perfectly readable in the brightest sunlight and is backlit for use in low-light conditions.
  • Handheld, portable, data logger with customizable warning flag settings, graphing and measurement statistics.
  • Optional LiNK connectivity powered by Bluetooth Smart® provides wireless communication to mobile devices and computers and easy data export for sharing with crew members.
  • Rugged (drop tested to MIL-STD-810G standards), waterproof (sealed to IP67 standards) and floats.
  • User-Replaceable Impeller
  • Protective pouch, neck lanyard and Lithium AA battery included. • 5-year warranty.
Measures
  • Wind Speed
  • Current Wind Speed
  • Average Wind Speed
  • Maximum Wind Gust
  • Temperature
  • Barometric Pressure
  • Relative Humidity
  • Wind Chill
  • Heat Stress Index
  • Density Altitude
  • Dew Point Temperature
  • Wind Direction
  • Naturally Aspirated Wet Bulb Temperature
  • Globe Temperature
  • Wet Bulb Temperature (Psychrometric)
  • WBGT (Wet Bulb Globe Temperature)
  • Thermal Work Limit (TWL)
  • Probability of Ignition (PIG)
  • Fine Dead Fuel Moisture (FDFM)
  • Pressure Trend
  • Bluetooth (LiNK model)
  • Vapor Pressure Deficit (VPD)
What else is included?
  • (1) AA Lithium Battery
  • Instructions
  • Protective Draw String Pouch
  • Lanyard
  • Certificate Of Conformity (Spec Sheet)
Downloads | Manuals | Specifications

Dimensions:

  • 6.5 x 1.8 x 1.1 in. / 16.5 x 4.5 x 2.8 cm
Weight:
  • 3.9 Ounces / 102 Grams

  • 5 stars: 2 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Branden M.

Awesome customer service!!

J
James W.

The 5400 provides a more accurate reading than other WGBT units at a reasonable price. It is easy to use and calibrate.

Designed and Built in the USA. Kestrel Instruments are known for their accuracy, toughness, and reliability in the field. Trusted by professionals worldwide for precision weather measurement and environmental data logging.