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Professional equipment for wildland firefighters

Kestrel® 4200 Pocket Air Flow Tracker

The Kestrel 4200 provides automatic humidity ratio readings as well as measuring relative humidity, dewpoint, wet bulb temperature, and heat stress index.

($350.00 taxes not included)
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More Technical specifications

The patented dual chamber humidity sensor ensures fast, accurate readings in any environment. This versatile instrument also measures current, average, and maximum air velocity; volume air flow; temperature in °F or °C; barometric pressure; altitude; and wind chill.

Combine the Kestrel 4200 with a portable vane mount and portable tripod (each sold separately) for a data-logging weather station that rotates in even the slightest breeze and is ideal for short-term monitoring. The Kestrel 4200 shows results on a multi-function three-line backlit display, stores 1,600 data points, is waterproof, and floats. Includes a protective pouch, neck and wrist lanyards, and 2 AAA batteries. Two-year manufacturer’s warranty. Assembled in the USA.


· Minimum wind speed: 0.8 mph (0.6 knots, 1.0 km / h, 0.4 m / s or 59 fpm).
· Maximum wind speed: 89.0 mph (78.0 knots, 144 km / h, 40.0 m / s, or 7.877 fpm).
· Wind speed accuracy: ± 3%.
· Update: 1 second.
· Air flow range: 0 to 99,999 cfm, m3 / h, m3 / m, or L / s, 0.0 to 9999.9 m3 / s.
· Temperature and wind chill accuracy: ± 1 °C.
· Wind chill factor resolution: ± 0.1 °C.
· Relative humidity accuracy: ± 3% from 5% to 95%.
· Ratio Humidity accuracy: ± 10% typical.
· Dew point temperature accuracy: ± 2 °C.
· Heat index accuracy: ± 2 °C *.
· Temperature Resolution: ± 0.1 °F (± 0.1 °C).
· Barometric pressure accuracy: ± 1.5 hPa / mb (at 25.0 °C, <6,000 m).
· Altitude range: at 77.0 ° F, <19.700 ', max error ± 98' (at 25.0 °C, <6,000 m, max error ± 30 m).
· Density altitude range: 32.0 ° F to 100.0 °F, 5.0 to 95.0% RH, 8.86 to 32.48 inHg, <19.700 '(0.0 °C to 37.8 °C, 5.0 to 95.0% RH, -2.000 to 9.000 hPa, <6000 m ).
· Operating temperature: -4 ° F to +140 ° F (-20 °C to +60 °C).
· Temperature range: -20 ° F to +158 ° F (-29 °C to +70 °C).

Accurate readings can be taken by keeping the unit warmer than -4°F (-20°C) and exposing it for the minimum time necessary (less than one minute) to take a reading. Impeller: 1 diameter, sapphire bearings, lightweight.

Temperature sensor: hermetically sealed precision thermistor. Humidity sensor: polymer capacitive sensor. Display: graphical backlit LCD. Sealing: electronics enclosure IP67 water resistant to 3 ft., Floats.

Battery: two AAA alkaline batteries (included). Battery life: 400 hrs. Dimensions: 5 x 1.8 x 1.1".

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