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Boothwyn, PA - September 3, 2020


Maximize effectiveness, minimize waste, and avoid harmful off-target drift with the new portable, connected 3550AG meter for pesticide spraying applications — the latest from the trusted line of Kestrel(R) environmental handheld weather monitoring devices. Rugged, waterproof, affordable, and easy-to-use, the 3550AG comes equipped with Bluetooth® connectivity for instant wireless data capture to a mobile device and shareable reports with the free Kestrel app.

Kestrel Instruments, a Nielsen-Kellerman® brand, announces the release of the Kestrel 3550AG Spraying Weather Meter. Precise on-site wind, temperature and humidity awareness is the key to avoiding spray drift liability and maximizing application results. There is no easier and more affordable tool for this job than the portable, rugged, handheld Kestrel 3550AG. With just your phone and this Bluetooth-enabled weather meter, users can capture critical weather data throughout their workday and anywhere on their operation.

Field-Level Monitoring for Reliable Decision-Making and Mitigating Risk

Farmers put themselves and their business at risk every time they spray a field without measuring and documenting the wind speed and environmental conditions.  Off-target pesticide drift can not only cause damage to nearby vulnerable crops but also pose a serious threat to people, livestock, wildlife, and the surrounding community. No matter the size of the operation, effective herbicide and pesticide application is critical to financial success. The Kestrel 3550AG ($199) fits in a pocket yet is equipped with factory-calibrated sensors to measure wind speed and direction, relative humidity, and more. Dew Point and Delta T readouts help the applicator avoid wasteful spray evaporation in excessively dry conditions. Plus, carrying a Kestrel in the spray equipment ensures readings can be taken exactly as recommended - at the field location and at the height of the spray boom. Readings from apps or weather reports gather weather data miles away from the farm location and at the required 30’ height are in no way correct for on-site conditions.


  • Minimum/maximum/average readings
  • Snapshot mode captures and saves all live measurements
  • Bluetooth® Mobile Device Connectivity and Free Kestrel iOS and Android Apps
  • Simple 3-button operation
  • High contrast, sunlight readable LCD display with backlight
  • Rugged design— IP67 waterproof & MIL-STD-810G drop-tested

Effortless Record Keeping & Data Export Capabilities

As regulations surrounding drift management get tighter and media and public attention continues to increase, the stakes are higher than ever for applicators and farmers when it comes to accountability. It is imperative to measure and document spray conditions at the time of application to be ready to defend against a claim of spray drift damage . The Kestrel 3550AG with Bluetooth connectivity makes it easy to instantly capture and log accurate weather data with just one-click. The free iOS or Android Kestrel app allows the user to view, manage, save, and export their captured data with just their phone for instant access and convenient reporting on spraying conditions.

To order, or for additional information on the Kestrel 3550AG Spraying Weather Meter, please visit

About Nielsen-Kellerman

Nielsen-Kellerman (NK) is the parent company for a family of measuring and monitoring technology brands focused on providing the accurate performance and weather data needed for safety, business success, research and defense as well as athletic and recreational activities. NK specializes in building products that perform in the most challenging outdoor environments from the water to the desert. NK's largest division is the weather division, encompassing
Kestrel® Weather and Environmental Meters, Ambient Weather® Stations and internet dashboards, and RainWise® Professional Grade Weather Stations and Rain Gauges. NK also designs and builds NK Sports Performance electronics for rowing and paddling, Kestrel® Ballistics Meters for long-range shooting, and Blue Ocean Rugged Megaphones for outdoor use. NK makes the majority of its products in the USA and is proud to be both a recognized leader in Lean Manufacturing and an award-winning top workplace. For more information, visit

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