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Kestrel 3500FW Fire Weather Meter

Kestrel

Ships from Extreme Meters in 1 business day.

Regular price $199.00 USD

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5 in stock

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Measure weather conditions quickly and easily with the trusted tool of firefighters, now with wet bulb and barometer measurements included.

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 fire fighting, 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.

Measures

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

Physical Specifications

  • Dimensions: 4.8 x 1.7 x 0.7 in. / 122 x 42 x 18 mm
  • Weight: 2.3 Ounces / 65 Grams
  • MFG Part# 0835FWORA, Model# 3500FW (Orange)

Related Item:

Wind Speed, Temperature, Barometric Pressure, Relative Humidity, Wind Chill, Heat Stress Index, Dew Point Temperature, Altitude (Barometric), and Wet Bulb Temperature (Psychrometric)

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

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

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