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Quick Details

  • Place of Origin: United States
  • Brand Name: Kestrel
  • Model Number: 5500

Packaging & Delivery

Delivery Detail: 1month

This instrument was produced under rigorous factory production control and documented standard procedures. It was individually inspected and leak tested and the functioning of the display, backlight, buttons and firmware were verified. The accuracy of each of its primary measurements was individually calibrated and /or validated according to documented standard test procedures against the standards detailed below. This instrument is warrantied to perform at the date of first consumer purchase in compliance with the published specifications, including stated drift since the date of manufacture, for the specific measurements and features of its model number. (See Kestrel Limited Warranty for full warranty terms.)

Standards Used in Testing

Wind Speed:

The Kestrel Weather & Environmental Meter impeller installed in this unit was individually tested in a subsonic wind tunnel operating at approximately 300 fpm (1.5 m/s) and 1200 fpm (6.1 m/s) monitored by a Gill Instruments Model 1350 ultrasonic time-of-flight anemometer. The Standard’s maximum combined uncertainty is ±1.04% within the airspeed range 706.6 to 3923.9 fpm (3.59 to 19.93 m/s), and ±1.66% within the airspeed range 166.6 to 706.6 fpm (0.85 to 3.59 m/s).


Temperature response is verified in comparison with an Ametek DTI-050 Digital Temperature Indicator and STS Reference Sensor. The DTI-050 is calibrated annually and is traceable to NIST with a maximum relative expanded uncertainty of ± 0.40C.

Direction / Heading

The sensitivity of the magnetic directional sensor is verified after assembly by orienting the unit to the cardinal directions and confirming themagnetic field output. The compass output is accurate to within ± 5 degrees as compared to a Suunto KB-14/360R G precision compass.

Relative Humidity:

Relative humidity is verified in comparison with an Edgetech HT120 Humidity Transmitter. The HT120 is calibrated annually and is traceable to NIST with a maximum relative expanded uncertainty of ±1.0%RH.

Barometric Pressure:

Pressure response is verified against a Vaisala PTB210A Digital Barometer. The Vaisala Barometer is calibrated annually and is traceable to NIST with a maximum relative expanded uncertainty of ± 0.3hPa.


Product Specifications for Kestrel 5 Series Weather/Environmental Meters

Wind Speed | Air FlowLarger of 3% of reading, least significant digit or 20 ft/min

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. *F/S only in Ballistics units. Beaufort not available in Ballistics units.
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.
Relative Humidity2%RH0.1 %RH10 to 90% 25°C non-condensingTo 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.


1.5 hPa|mbar 0.022 PSI

0.01 inHg 0.1hPa|mbar 0.01 PSI


20.67-32.48 inHg 700-1100hPa|mbar 10.15-15.95 PSI

Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Between 1100–1200 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1200 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 magnetoresistive 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.



 Air Density

0.0002 lb/ft3

0.0033 kg/m3 

0.001 lbs/ft3 0.001 kg/m3 Temperature, Relative Humidity Pressure 
 Air Flow6.71% 

1 cfm

1 m3/hr

1 m3/m


1 L/s 

Air Flow, User Input (Duct Shape & Size) 

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/ Tailwind7.1%1 mph, 1 ft/min, 0.1 km/h, 0.1 m/s, 0.1 knotsWind Speed, Compass
Delta T

3.2 °F

1.8 °C

0.1 °F

0.1 °C

Temperature, Relative Humidity Pressure 
Density Altitude 

226 ft

69 m

1 ft

1 m

Temperature, Relative Humidity Pressure
Dew Point

3.4 °F

1.9 °C

15-95% RH. Refer to Range for Temperature Sensor

0.1 °F

0.1 °C

Temperature, Relative Humidity
Evaporation Rate

0.01 lb/ft2/hr

0.06 kg/m2/hr

0.01 b/ft2/hr

0.01 kg/m2/hr

Wind Speed, Temperature Relative Humidity Pressure, User Input (Concrete Temperature)
Heat Index



0.1 °F

0.1 °C

Temperature, Relative Humidity
Moisture Content | Humidity Ratio (“Grains”)



0.1 gpp

0.01 g/kg

Temperature, Relative Humidity Pressure
Probability of Ignition (PIG)

Max: 10%PIG

Accuracy dependent on proximity to reference table threshold.

10%PIGTemperature, Relative Humidity
Relative Air Density0.3% 0.1% Temperature, Relative Humidity Pressure
Wet Bulb Temperature - Psychrometric 

3.2 °F

1.8 °C 

0.1 °F

0.1 °C

Temperature, Relative Humidity Pressure
Wind Chill

1.6 °F

0.9 °C

0.1 °F

0.1 °C

Wind Speed, Temperature



Display & BacklightMultifunction, multi-digit monochrome dot-matrix display. Choice of white or red LED backlight.
Response Time & Display UpdateDisplay updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity.
Data Storage & Graphical Display, Min/Max/Avg HistoryLogged history stored and displayed for every measured value. Manual and auto data storage. Min/Max/Avg history may be reset independently. Auto-store interval settable from 2 seconds to 12 hours, overwrite on or off. Logs even when display off except for 2 and 5 second intervals. Kestrel 5 series units hold over 10,000 data points.
Data Upload & Bluetooth® Data Connect OptionWireless range up to 100ft. Connection requires optional USB data transfer cable or Kestrel Link Dongle or Kestrel LiNK app. Employs Kestrel Link protocol for data transmission with Link supported devices. (Kestrel LiNK for iOS/Android, Kestrel Link for PC/MAC).
Clock / CalendarReal-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment.
Auto ShutdownUser-selectable – Off, 15-60 minutes with no key presses.
LanguagesEnglish, French, German, Spanish.
CertificationsCE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards.
OriginDesigned and manufactured in the USA from US and imported components. Complies with Regional Value Content and Tariff Code Transformation requirements for NAFTA Preference Criterion B.
Battery LifeAA Lithium, included. Up to 400 hours of use, reduced by backlight or Bluetooth radio transmission use.
Shock ResistanceMIL-STD-810g, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller.
SealingWaterproof (IP67 and NEMA-6)
Display & Battery Operational Temperature Limits14° F to 131° F | -10 °C to 55 °C Measurements may be taken beyond the limits of the operational temperature range of the display and batteries by maintaining the unit within the operational range and then exposing it to the more extreme environment for the minimum time necessary to take reading.
Storage Temperature-22.0 °F to 140.0 °F | -30.0 °C to 60.0 °C.
Size & Weight5.0 x 1.9 x 1.1 in / 12.7 x 4.5 x 2.8 cm, 4.3 oz / 121 g. (Lithium battery included)
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