• Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com
  • Kestrel 3550AG Agricultural Meter with Delta T
  • Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com
  • Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com
  • Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com
  • Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com
  • Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter - ExtremeMeters.com

Kestrel 3550AG Pocket Delta T Crop Spraying Weather Meter

0835AGLCHVG

1,822.00 GTQ
1,822.00 GTQ
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Ships within 1 business day

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Warranty

5 year manufacturers warranty.

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45 Day Easy Returns
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Product Information

Sensor Measures

Wind Speed, Current Wind Speed, Average Wind Speed, Maximum Wind Gust, Temperature, Barometric Pressure, Relative Humidity, Wind Chill, Heat Stress Index, Dew Point Temperature, Wet Bulb Temperature (Psychrometric), Temperature-Humidity Index (THI), Altitude (Barometric), Delta-T, Wind Direction, and Bluetooth

Product Features

Comprehensive Weather Measurements: The Kestrel 3550AG provides critical weather data including wind speed, current wind speed, average wind speed, maximum wind gusts, temperature, barometric pressure, relative humidity, wind chill, heat stress index, dew point temperature, wet bulb temperature (psychrometric), altitude (barometric), and temperature-humidity index (THI). This information is essential for assessing spraying conditions and ensuring safety during pesticide, herbicide, or fungicide applications.

Delta-T for Crop Spraying: Delta-Tis a vital factor for determining optimal crop spraying conditions. This feature helps applicators assess whether the environmental conditions are suitable for effective spraying and minimizing the risk of drift. By factoring in temperatureand humidity, the Kestrel 3550AGensures you stay within safe spraying guidelines and select the best nozzle for the job.

Bluetooth Connectivity: The Kestrel 3550AG comes with Bluetooth technology, enabling you to sync data with your mobile device or other compatible apps. This makes it easy to record and timestamp weather data, keeping track of environmental conditions throughout your spraying activities and simplifying your record-keeping process for compliance and reporting.

Drift Management: With real-time data on wind speed and Delta-T, the Kestrel 3550AG helps you manage drift during crop spraying. By understanding wind conditionsand humidity, you can adjust your spraying technique to reduce off-target drift, protecting nearby crops, waterways, and sensitive areas.

Waterproof & Floats: Designed to withstand tough outdoor conditions, the Kestrel 3550AG is waterproof and floats if dropped in water, making it an ideal tool for spraying in variable weather conditions, on boats, or in wet environments.

Built to Last – Made in the USA: The Kestrel 3550AG is designed and built in the USA to provide durability, accuracy, and reliability. It’s the trusted choice for professionals in agriculture, including those working in the field or handling crop spraying operations.

Customer Satisfaction: Rated 5.00 out of 5 stars from 4 reviews, the Kestrel 3550AG is highly regarded for its accuracy, ease of use, and reliability in field conditions. Customers appreciate how the meter aids in crop spraying and drift management, with one customer stating it’s helped keep their sprays on target and another praising its Bluetooth features for record-keeping.

5-Year Manufacturer's Warranty: The Kestrel 3550AG comes with a 5-year manufacturer’s warranty, ensuring you receive a long-lasting, high-quality product you can rely on for years to come.

Easy to Use: With a user-friendly interface and three-button operation, the Kestrel 3550AGmakes it easy to gather the weather data you need, whether you're working on a farm, ranch, or in the field.

Certificate of Conformity: Each Kestrel 3500 includes a certificate of conformity, confirming that it meets high standards of quality and provides precise, accurate measurements.

Data Hold Mode: The Hold Mode is helpful for capturing measurements when you're unable to view the display in real-time.

High-contrast monochrome LCD display: Easily readable in direct sunlight.

User-Replaceable Impeller: Every Kestrel Impeller is tested at high and low speeds. The impeller is easily replaced if needed.

Slip-On Protective Cover: Keep your Kestrel protected when not in use with a hard cover that simply slides up the lanyard and over the Kestrel.

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

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

Delta T
Accuracy (+/-):
  • 3.2 °F
  • 1.8 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity
  • Pressure

THI (NRC)*
Accuracy (+/-):
  • 1.5 °F
  • 0.8 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity
Notes: * The NRC THI equation is defined as: *THI = (1.8 X Tdb +32) – [(.55 - .0055 X RH) X (1.8 X Tdb-26)] (National Research Council, 1971) where Tdb is dry bulb temperature in °C and RH is relative humidity expressed as a %. This is the equation referenced by Ontario Ministry of Agriculture, Food, and Rural affairs; Journal of Dairy Science; and the University of Arizona. The YOUSEF THI equation is defined as: THI = Tdb + (0.36 × Tdp) + 41.2 (Yousef, 1985) where Tdb is dry bulb temperature in °C and Tdp is dew point temperature in °C. This is the equation referenced by Dairy Australia, University of Missouri, and USDA.

THI (Yousef)*
Accuracy (+/-):
  • 2.3 °F
  • 1.3 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity
Notes: * The NRC THI equation is defined as: *THI = (1.8 X Tdb +32) – [(.55 - .0055 X RH) X (1.8 X Tdb-26)] (National Research Council, 1971) where Tdb is dry bulb temperature in °C and RH is relative humidity expressed as a %. This is the equation referenced by Ontario Ministry of Agriculture, Food, and Rural affairs; Journal of Dairy Science; and the University of Arizona. The YOUSEF THI equation is defined as: THI = Tdb + (0.36 × Tdp) + 41.2 (Yousef, 1985) where Tdb is dry bulb temperature in °C and Tdp is dew point temperature in °C. This is the equation referenced by Dairy Australia, University of Missouri, and USDA.

Downloads:

Kestrel 3550AG Spraying Weather Meter – Designed for Accurate Crop Spraying Conditions – USA-Made, Waterproof, Floating, Bluetooth-Enabled with Delta-T, Wind Speed, Temperature & More

The Kestrel 3550AG Spraying Weather Meter is a top-tier, USA-made weather meter designed specifically for the agricultural industry, enabling farmers and applicators to accurately assess crop spraying conditions and ensure effective, safe applications. Whether you're measuring wind speed, temperature, humidity, wind chill, or Delta-T, this meter helps you make informed decisions for optimal spraying. The Kestrel 3550AG also provides Bluetooth connectivity, allowing for seamless data logging, record-keeping, and drift management in real-time.

Perfect for Agricultural Spraying and Drift Management

The Kestrel 3550AG Spraying Weather Meter is designed to meet the specific needs of agricultural professionals. By providing critical data on wind speed, temperature, humidity, and Delta-T, it helps you ensure safe and effective crop spraying. With features like Bluetooth connectivity, waterproof construction, and drift management tools, the Kestrel 3550AG is a reliable companion for managing spraying conditions, tracking weather data, and optimizing your spraying operations.

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Customer Testimonials

Reviews by our customers

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    I ordered the Kestrel 3550FW meter. Received email notifications reporting the progression of my order up to delivery, which was much quicker than I'd expected. Couldn't be more pleased with the product and service.

    Heidi
    Wildland Firefighter

  • The service was prompt and cordial.

    The service was prompt and cordial. The Kestrel is used to measure wind velocity and temperature when applying pesticides for agriculture crop production. It is also used to measure weather conditions for livestock comfort.

    Arlyn Midtgaard
    Crop Management

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    Weather Enthusiast

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    Weather Enthusiast