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Kestrel 5400 WBGT Heat Stress Tracker & Weather Meter with LINK

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Item #: 0854LVC
MFG: Kestrel
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Kestrel 5400 WBGT Heat Stress Tracker & Weather Meter with LINK

The Kestrel 5400 is a trusted and accurate handheld, portable, WBGT (Wet Bulb Globe Temperature) measurement tool and environmental data logger. No need for distilled water, bulky globes, complicated setup or expensive equipment. Getting accurate measurements couldn’t be easier: just hold the Kestrel Heat Stress Tracker in the area of interest for both instantaneous and average WBGT measurements. Set the appropriate WBGT thresholds for flag warnings and the loud buzzer, bright LED beacon and on-screen warnings provide instant notification of dangerous conditions. The Kestrel 5400 even comes preprogrammed with several athletics, industrial, and military guidelines to further ease the set-up process.

Unlike other WBGT meters on the market, the Kestrel 5400 is a full-featured weather meter as well. Measure wind speed, maximum wind gusts, temperature, humidity, pressure, wind chill, density altitude and more. No matter what your activity, the Kestrel 5400 provides insight into the critical conditions affecting safety, performance and success. The Kestrel 5400 with LiNK wireless data communication adds a compass for tracking wind direction as well, expanding its usability to include HAZMAT response, and even measuring headwind at the running track!

Environmental Measures:

  • Altitude (Barometric)
  • Barometric Pressure
  • Compass Direction
  • Crosswind
  • Density Altitude
  • Dew Point Temperature
  • Globe Temperature
  • Headwind/Tailwind
  • Heat Stress Index
  • Naturally Aspirated Wet Bulb Temperature
  • Relative Humidity
  • Station Pressure (Absolute Pressure)
  • Temperature
  • Thermal Work Limit (TWL)
  • Wet Bulb Globe Temperature (WBGT)
  • Wet Bulb Temperature (Psychrometric)
  • Wind Chill
  • Wind Direction
  • Wind Speed/Air Speed

Package Includes:

  • Battery - 1 x AA
  • Certificate Of Conformity (Spec Sheet)
  • Heat Stress Reference Card (Waterproof)
  • Instructions
  • Lanyard
  • Protective Drawstring Pouch

Kestrel 5400 WBGT Heat Stress Tracker & Weather Meter with LINK

Wind Speed|Air Larger of 3% of reading, least significant digit or 20 ft/min Speed 0.1 m/s
1 ft/min

0.1 km/h

0.1 mph

0.1 knots

1 B*

0.1 F/S*
0.6 to 40.0 m/s
118 to 7,874 ft/min

2.2 to 144.0 km/h

1.3 to 89.5 mph

1.2 to 77.8 knots

0 to 12 B*

1 inch|25 mm diameter impeller with precision axle and low-friction Zytel® bearings. Startup speed stated as lower limit, readings may be taken down to 0.4 m/s |79 ft min|1.5 km/h |.9 mph |.8 kt after impeller startup. Off-axis accuracy -1% @ 5º off axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH|7 m/s. Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753). Wind speed calibration and testing should be done with triangle on impeller located at the top front face of the Kestrel. Measuring wind speeds above 60 m/s / 134.2 mph can damage the impeller
Ambient Temperature 0.9 °F (0.5 °C)
0.1 °F (0.1 °C)
-20.0 to 158.0 °F (-29.0 to 70.0 °C)
Airflow of 2.2 mph|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Display & Battery Operational Temperature Limits.
Globe Temperature 2.5 °F (1.4 °C)
0.1 °F (0.1 °C)
-20.0 to 140.0 °F
(-29.0 to 60.0 °C)
Temperature inside 1in|25 mm black powder coated copper globe converted to Tg equivalent for standard 6 in|150 mm globe. Closest equivalence obtained with airflow greater than 2.2 mph|1 m/s.
Relative Humidity 2%RH 0.1 %RH 10 to 90% 25°C noncondensing To achieve stated accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift is typically less than ±0.25% per year.
Pressure 1.5 hPa|mbar
0.044 inHg

0.022 PSI
0.1 hPa|mbar
0.01 inHg

0.01 PSI
700-1100 hPa|mbar

20.67-32.48 inHg

10.15-15.95 PSI
Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.
1/16th Cardinal Scale
0 to 360° 2-axis solid-state magneto-resistive sensor mounted perpendicular to unit plane. Accuracy of sensor dependent upon unit’s vertical position. Self-calibration routine eliminates magnetic error from batteries or unit and must be run after every full power- down (battery removal or change). Readout indicates direction to which the back of the unit is pointed when held in a vertical orientation. Declination/variation adjustable for True North readout.
AHLU AHLU Accuracy derived from HLI accuracy accumulated over time. 1.0 Wind Speed, Temperature Globe Temperature, Relative Humidity
Altitude typical: 23.6 ft/7.2 m
from 750 to 1100 mBar

max: 48.2 ft/14.7 m

from 300 to 750 mBar
1 ft

1 m
Pressure, User Input (Reference Pressure)
Barometric Pressure 0.07 inHg
2.4 hPa|mbar

0.03 PSI
0.01 inHg
0.1 hPa|mbar

0.01 PSI
Pressure, User Input (Reference Altitude)
Crosswind & Headwind/Tailwind 7.1% 1 mph
1 ft/min

0.1 km/h

0.1 m/s

0.1 knots
Wind Speed, Compass
Density Altitude 226 ft (69 m)
1 ft

1 m
Temperature, Relative Humidity Pressure
Dew Point 3.4 °F (1.9 °C)
95% RH. Refer to Range for Temperature Sensor
0.1 °F (0.1 °C)
Temperature, Relative Humidity
Heat Index 7.1°F (4.0°C)
0.1 °F (0.1 °C)
Temperature, Relative Humidity
HLI 2.7 1.0 Wind Speed, Temperature Globe Temperature, Relative Humidity
Outdoor Wet Bulb Globe Temperature (WBGT) 1.3 °F (0.7 °C)
0.1 °F (0.1 °C)
Wind Speed, Temperature Globe Temperature, Rative Humidity, Pressure
Probability of Ignition (PIG) PIG Accuracy dependent on proximity of inputs to reference table steps. 10% Temperature, Relative Humidity
THI (NRC) 1.5 °F (0.8 °C)
0.1 °F (0.1 °C)
Temperature, Relative Humidity
THI (Yousef) 2.3 °F (1.3 °C)
0.1 °F (0.1 °C)
Temperature, Relative Humidity
Thermal Work Limit (TWL) 10.9W/m2 0.1 °F (0.1 °C)
TWind Speed, Temperature Globe Temperature, Relative Humidity, Pressure
Wet Bulb Temperature - Psychrometric 3.2 °F (1.8 °C)
0.1 °F (0.1 °C)
Temperature, Relative Humidity Pressure
Wet Bulb Temperature - Naturally Aspirated (NWB TEMP) 1.4 °F (0.8 °C)
0.1 °F (0.1 °C)
Wind Speed, Temperature Globe Temperature, Relative Humidity, Pressure
Wind Chill 1.6 °F (0.9 °C)
0.1 °F (0.1 °C)
Wind Speed, Temperature

Kestrel 5400 WBGT Heat Stress Tracker & Weather Meter with LINK

  • Alarm buzzer
  • Alarm Light
  • Backlight - Switchable White/Red
  • Battery Life Indicator
  • Black Globe Temperature Sensor (1in/2.5cm)
  • Data Log Graph View
  • Data Logging - Adjustable Interval
  • Date & Time
  • Digital Compass (Pro model only)
  • Drop-Tested to MIL-STD-810G
  • FREE Kestrel LiNK Apps for Windows & Mac*
  • Integrated Flip Open Impeller Cover
  • Intuitive Tactile Up/Down/Enter Keypad
  • LiNK Wireless Communication - When Option Selected (Bluetooth low energy)*
  • Multilingual Menus (English, French, Spanish, German)
  • Minimum/Maximum/Average Reading
  • Pressure Sensor
  • Relative Humidity Sensor
  • Temperature Sensor (Patented External Isolated)
  • Waterproof to IP67 (3'/1M for 30 minutes)
  • WBGT Warning Flags - Settable

Kestrel 5400 WBGT Heat Stress Tracker & Weather Meter with LINK

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