Kestrel 5500AG Agriculture Weather Meter in hand
Kestrel 5500AG Agriculture Weather Meter in field
Kestrel 5500AG Agriculture Weather Meter front view
Kestrel 5500AG Agriculture Weather Meter on tripod

Kestrel 5500AG Agriculture Weather Meter

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The Kestrel 5500AG delivers all the environmental data you need for livestock care, crop production, barn welfare and other agricultural activities. This compact rugged IP67 rated handheld meter can be used within barns and livestock enclosures or to determine crop spraying conditions when wind speed and direction are of importance.

Crop Spray Management

The Kestrel 5500AG calculates Delta T measurements for determining acceptable spraying conditions. Delta T uses ambient temperature and dew point to provide guidance on the evaporation rate of sprayed chemicals, so you can select the best time and spray nozzle. The Kestrel 5500AG combines Delta T, wind speed, and direction with average wind speed and maximum wind gusts automatically ensuring the data is readily at hand to determine safe crop spraying conditions and manage spray drift.

Heat Stress Management with THI

THI (Temperature-Humidity Index) is used widely to measure and determine heat stress risk during livestock production and transportation operations. This measurement combines temperature and relative humidity to deliver management policies to maximise animal health, welfare and productivity. The Kestrel 5500AG calculates and logs on-site THI based on user selection of either the NRC (National Research Council, 1971) or Yousef (Yousef, 1985) accepted THI calculations.

Barn / Housing Ventilation Assessments

Barn ventilation and air movement are critical factors in delivering best practice for animal health, welfare and comfort. The Kestrel 5500AG can quantify air movement at the exact location helping to determine fan performance and duct discharge velocity. Automatic calculations take the duct shape and dimensions to deliver volume air flow calculations, no calculator is needed to determine airflow with the Kestrel 5500AG – a few quick menu picks and built-in averaging gives you accurate readings instantly.

Microclimate, Harvest and Storage Conditions

Many livestock professionals also grow and store grains, hay and other feedstuffs. The Kestrel 5500AG can measure micro-climates around the farm to determine where mould and disease may be a problem, ensuring conditions are right for harvesting, drying, and storage. Leave the Kestrel 5500AG in place anywhere in the field, barn or greenhouse to get a graphical history of overnight conditions.

The Kestrel 5500AG also calculates and logs over 10,000 sets of time-stamped data.

The Kestrel 5500AG has Bluetooth connectivity allowing you to transfer data wirelessly to an iOS (iPhone, iPad) device or Android smartphone or tablet when within range using the appropriate Kestrel LiNK App. You can also transfer data wirelessly to a Windows or Mac computer using the optional Kestrel Bluetooth USB Dongle (sold separately). Data can be viewed live on the App up to 100 feet away (line of sight).

When combined with the Kestrel Vane Mount and Kestrel Tripod the Kestrel 5500AG becomes a stand-alone environmental monitoring station as the large wind vane and precision pivot keep the Kestrel oriented into the wind for continuous measurement and logging of all the key environmental parameters.

Mil-SPEC-810G drop tested with an IP67 waterproof rating the Kestrel 5500AG is designed and constructed to withstand the harsh treatment it will receive in the agricultural industry. The unit comes with a five-year warranty and certificate of conformity as standard.


  • THI (Temperature-Humidity Index)
  • Delta T
  • Dew Point Temperature
  • Heat Stress Index
  • Relative Humidity
  • Air Flow
  • Current Wind Speed / Maximum Wind Gust / Average Wind Speed (mph, km/h, ft/min, m/s, knots and Beaufort)
  • Wind Direction (degrees and cardinal compass points)
  • Crosswind, Headwind, Tailwind
  • Temperature (Air,Water,Snow) / Wind Chill (Fahrenheit and Celsius)
  • Barometric Pressure (inHg and hPa (mb))
  • Station Pressure (Absolute Pressure)
  • Altitude
  • Density altitude
  • Wet Bulb Temperature (Psychrometric)
  • Exterior temperature, humidity & pressure sensors for fast & accurate readings


  • Large easily read high resolution, high contrast display with backlight
  • Time & Date
  • Customize screens to display user-selected measurements
  • Graph & recall trends
  • Min, Max & Average values
  • Automatically store measurements, when powered on or off
  • Manually store measurements with the press of a button
  • Customizable data storage - 10,000 data points
  • Data charting
  • LiNK connectivity powered by Bluetooth® low energy provides wireless communication to mobile devices and computers.
  • Data upload to iOS & Android phones & tablets
  • Data upload to Windows or Mac computers with optional USB Data Cable
  • Data upload to Windows & Mac computers via wireless Bluetooth (LiNK Enabled Meters only with the optional Kestrel Dongle)
  • Standard user-replaceable AA Lithium Battery (Average Life 400 Hours)
  • Drop tested to MIL-STD-810G standards (10 drops from 4’)