Kestrel 3500FW Pocket Fire Weather Meter

Measure weather conditions quickly with the firefighters trusted tool.

£168.00 ~~£210.00~~

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Returnable until Jan 31, 2025

Kestrel | SKU: 0835FWORA | Barcode: 730650003068

Measures

Wind Speed
Current Wind Speed
Average Wind Speed
Maximum Wind Gust
Temperature
Barometric Pressure
Relative Humidity
Pressure Trend
Wind Chill
Heat Stress Index
Dew Point Temperature
Altitude (Barometric)
Wet Bulb Temperature (Psychrometric)

Includes

(1) CR2032 Lithium Battery
Instructions
Lanyard
Certificate Of Conformity (Spec Sheet)
Protective Cover - Hard Slip-on

Warranty

5 year manufacturers warranty.

US Manufacturing

The entire Kestrel line is designed and built in the USA. No other handheld weather meter is. Some electronic components have to be sourced overseas these days, but Kestrel buys American wherever possible. Kestrel believes US manufacturing is the only way to ensure that every Kestrel will do its job right. Kestrel believes it’s important to do its part to keep manufacturing alive and well in the US.

State Sales Tax Information

State sales tax not charged / collected on orders outside of Pennsylvania

Government / Education Pricing Available

Sensor Specifications

Sensor Specifications

Wind Speed
Units of Measure:	mph \| kt \| B \| m/s \| ft/min / km/h
Specification Range:	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* 2-131.2 F/S*
Operational Range:	0.6 to 60.0 m/s 118 to 11,811 ft/min 2.2 to 216.0 km/h 1.3 to 134.2 mph 1.2 to 116.6 knots 0 to 12 B* 2-196.9 F/S*
Resolution:	0.1 m/s 1 ft/min 0.1 km/h 0.1 mph 0.1 knots 1 B
Accuracy (+/-):	Larger of 3% of reading, least significant digit or 20 ft/min
Notes:	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 (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. *F/S only in Ballistics units. Beaufort not available in Ballistics units.
Ambient Temperature
Units of Measure:	Fahrenheit, Celsius
Specification Range:	-20.0 to 158.0 °F -29.0 to 70.0 °C
Operational Range:	14.0.0 to 131.0 °F -10.0 to 55.0 °C
Resolution:	0.1 °F 0.1 °C
Accuracy (+/-):	0.9 °F 0.5 °C
Notes:	Hermetically sealed, precision thermistor mounted externally and thermally isolated (US Patent 5,939,645) for rapid response. Airflow of 2.2 mph\|1 m/s or greater provides fastest response and reduction of insolation effect. Calibration drift negligible. Thermistor may also be used to measure temperature of water or snow by submerging thermistor portion into material -- remove impeller prior to taking submerged measurements and ensure humidity sensor membrane is free of liquid water prior to taking humidity-based measurements after submersion.
Pressure
Units of Measure:	inHg, hPA, mb
Specification Range:	25°C/ 77°F 750-1100 hPa\|mbar 22.15-32.48 inHg 10.88-15.95 PS
Operational Range:	0.30 to 48.87 inHg 10.0 to 1654.7 hPa\|mbar 0.14 to 24.00 PSI 14.0 to 131.0 °F -10.0 to 55.0 °C
Resolution:	0.1 hPa\|mbar 0.01 inHg 0.01 PSI
Accuracy (+/-):	1.5 hPa\|mbar 0.044 inHg 0.022 PSI
Notes:	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.
Relative Humidity
Units of Measure:	%
Specification Range:	5 to 95% 25°C non-condensing
Operational Range:	0 to 100%
Resolution:	0.1 %RH
Accuracy (+/-):	3%RH
Notes:	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.

Calculated Measurements

Wind Chill
Accuracy (+/-):	1.6 °F 0.9 °C
Resolution:	0.1 °F 0.1 °C
Sensors employed:	Wind Speed Temperature
Barometric Pressure
Accuracy (+/-):	0.07 inHg 2.4 hPa\|mbar 0.03 PSI
Resolution:	0.01 inHg 0.1 hPa\|mbar 0.01 PSI
Sensors employed:	Pressure User Input (Reference Altitude)
Altitude
Accuracy (+/-):	typical: 23.6 ft/7.2 m from 750 to 1100 mBar max: 48.2 ft/14.7 m from 300 to 750 mBar
Resolution:	1ft 1m
Sensors employed:	Pressure User Input (Reference Pressure)
Dew Point
Accuracy (+/-):	3.4 °F 1.9 °C 15-95% RH. Refer to Range for Temperature Sensor
Resolution:	0.1 °F 0.1 °C
Sensors employed:	Temperature Relative Humidity
Wet Bulb Temperature - Psychrometric
Accuracy (+/-):	3.2 °F 1.8 °C
Resolution:	0.1 °F 0.1 °C
Sensors employed:	Wind Speed Temperature
Heat Index
Accuracy (+/-):	7.1°F 4.0°C
Resolution:	0.1 °F 0.1 °C
Sensors employed:	Temperature Relative Humidity

Downloads:

Kestrel 3500FW Manual and Complete Sensor Specifications

Description

When fighting wildfires, protecting lives, houses, and property while ensuring safety for everyone involved demands accurate fire behavior predictions based upon good weather observations.

Kestrel weather meters have been relied upon by fire fighters for decades to provide fast, accurate measurement of wind speed, temperature and humidity. The Kestrel 3500 (MPN# # 0835FWORA) Fire Weather Meter has been updated specifically for firefighting, adding barometric pressure, altitude and wet bulb readings and an easy-to-read Probability of Ignition (PIG) and Fine Dead Fuel Moisture (FDFM) reference card – everything required for a complete weather observation. This one rugged, handheld instrument easily replaces all of the items included in your Belt Weather Kit, providing consistently accurate measurements without prepping a sling psychrometer or risking the possibility of human error.

IP67 waterproof and Mil-SPEC-810G drop tested, Kestrels are built for the abuse that work on a fire line can dish out. The Kestrel 3500 Fire Weather Meter includes a hard, rubberized slip-on cover that protects the display and impeller, even when tossed in your pack. Kestrel Weather & Environmental Meters are designed & manufactured in the U.S.A and are backed by our 5-year warranty. Each Kestrel 3500 is factory calibrated and comes with a certificate of conformity and may be factory or field recalibrated.

Features:

Simple 3-Button Control
High Contrast, Sunlight Readable Monochrome LCD Display
Backlight (Blue white)
Temperature Sensor (Patented External Isolated)
CR2032 Coin Cell Battery (Average Life 300 Hours)
Data Hold Function
Drop-Tested to MIL-STD-810G
Waterproof to IP67 (3'/1M for 30 minutes)
Kestrel Certificate of Conformity
Neck Lanyard
Patented Impeller and Sensor Technology
Slip-On Protective Cover
Time of Day
User-Replaceable Batteries
User-Replaceable Impeller
Waterproof & Floats
Designed and built in the USA
Waterproof PIG Reference Card

Payment & Security

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Had this device about a week and just getting the hang of it. Can't wait to use it in Alaska next month.

A little Peace of mind for mom
My son is stationed in CA Desert. I wanted him to have a dependable lightweight piece of equipment that did not need blue tooth to work on his adventures and this has so far been very relialable and provided good information for hikes and exploring in extreme heat. I feel better knowing he has this light weight meter with him.