About the Kestrel DROP D2AG Livestock Heat Stress Monitor

Heat stress in livestock can lead to serious animal health issues, decreased milk production, and compromised herd performance.

Stay informed of heat conditions in the barn or during transport with the Kestrel D2 Livestock Heat Stress Monitor. Multiple built-in environmental measurements mean your DROP D2 can also be used for many other agricultural applications including hay and feed storage areas and greenhouses.

The Kestrel Drop D2 Livestock Heat Stress Monitor is a very affordable rugged heat stress monitor that can be used in the barn, during transport, or anywhere livestock are housed. Simply hang in place wherever insight into conditions is needed, and access current conditions and historical readings with your iOS or Android device. Designed by Kestrel with input from some of the world's most respected experts in livestock heat stress, the Kestrel DROP D2 Livestock Heat Stress Monitor is designed to help you MEASURE and MANAGE your animals’ heat stress, ensuring you MAXIMIZE your bottom line.

  • Direct readout of Temperature Humidity Index (THI) – a dairy cattle specific measurement that provides guidance for when heat stress will start to reduce milk production.  
  • Also measures heat stress index, temperature, humidity and dew point for application to many types of livestock and agricultural applications.
  • The EASIEST and most accurate way to monitor and track environmental measurements critical to agriculture in almost any farm, home or transport location – wet or dry, indoors or out.
  • Easily hangs inside a barn, transport vehicle or wherever livestock are housed.
  • Horse shippers - monitor trailer temperatures and heat index from inside your truck! Know when to find shade or take a break to water your horses.
  • View data wirelessly with Kestrel LiNK app, powered by Bluetooth® low energy, on mobile devices and computers when within 100’ of device. See, save and share data from multiple DROPs with just one phone or tablet.
  • Store thousands of data points and get months of logging on a single coin-cell battery - customize logging rate, connections and alerts
  • Android 4.3 and higher. Works with most Android devices with Bluetooth® low energy, including Samsung Galaxy, Nexus 4, Motorola, Android and other recent generation phones and tablets.
  •  iOS 6 installed iPhone 4s, iPad 3rd generation or later.
  • Rugged (drop tested to MIL-STD-810G standards), dust and waterproof (sealed to IP67 standards).
  • 5-year warranty.
Use a DROP Anywhere livestock are housed- Small, Accurate, Rugged and Waterproof

Each DROP measures just 1 x 1.8 x 2.4 inches (24 x 46 mm x 60 mm) and weighs just 1.2 ounces (34 grams).  DROP loggers meet military and international standards for water, dust and shock resistance (IP-67 and MIL-STD-810G) and are conveniently equipped with a sturdy d-ring for hanging wherever needed.

Requirements:
  • iOS 6 installed iPhone 4s, iPad 3rd generation, iPod Touch 5th generation and above.
  • Android 4.2 and higher. Works with most Android devices with Bluetooth® low energy, including Samsung Galaxy, Nexus 4, Motorola Droid, and other recent generation phones and tablets.
Who's using DROP's?
  • Poultry Producers
  • Swine Producers
  • Sheep Producers
  • Goat Producers
  • Beef Operations
  • Dairy Producers
  • Processors
  • Veterinarians
  • Livestock Nutritionists
  • Transportation Providers
  • Researchers
Features:
  • Bluetooth Smart (Wireless Technology)
  • Data Logger
  • Drop-Tested, MIL-STD-810G
  • IP67 Waterproof
  • Lightweight & Durable
  • User-Replaceable CR2032 Battery
Features
  • Drop-Tested to MIL-STD-810G
  • Floats
  • LiNK Wireless
  • Communication to Mobile Devices (Bluetooth low energy)*
  • Relative Humidity Sensor
  • Temperature Sensor (Patented External Isolated)
  • Waterproof to IP67 (3'/1M for 30 minutes)
Measures
  • Temperature
  • Relative Humidity
  • Heat Stress Index
  • Dew Point Temperature
  • Temperature-Humidity Index (THI)
What else is included?
  • (1) CR2032 Lithium Battery
  • Instructions
  • Certificate Of Conformity (Spec Sheet)
Downloads

Kestrel Instruments

Designed and Built in the USA. Kestrel Instruments are known for their accuracy, toughness, and reliability in the field. Trusted by professionals worldwide for precision weather measurement and environmental data logging.

FAQs

What makes Kestrel meters different from other weather instruments?

Kestrel meters combine rugged durability, precision engineering, and field-proven reliability in a compact design. Built for professional use in harsh environments, they deliver accurate real-time data for weather monitoring, environmental research, and outdoor operations. Unlike consumer-grade instruments, Kestrel meters are engineered to withstand extreme conditions while maintaining measurement accuracy that professionals depend on. Kestrel instruments are trusted by meteorologists, researchers, outdoor enthusiasts, and industrial teams worldwide for their consistent performance and dependable results in the field.

What warranty coverage do your Kestrel Instruments include, and what is not covered?

Kestrel Instruments include a full 5-year limited lifetime warranty against defects in materials and workmanship under normal use. Coverage includes the meter body, display, and internal components. The warranty does not cover damage from misuse, neglect, unauthorized repair, water immersion beyond rated specifications, battery leakage, or wear from normal operation. Accidental drops, extreme temperature exposure, and chemical exposure are also excluded. For specific coverage details and warranty registration, please contact our support team or consult your product documentation.

What makes Kestrel meters suitable for professional field work?

Kestrel meters are engineered for demanding field conditions with rugged construction, precision sensors, and reliable performance in extreme environments. Built to withstand harsh weather, dust, and impact, they deliver accurate environmental data in real-time—whether you're monitoring livestock conditions, conducting agricultural research, or managing outdoor operations. Their compact design, intuitive interface, and long battery life make them practical tools for professionals who need dependable measurements without compromise.

What is your shipping policy?

We offer worldwide shipping with competitive rates calculated at checkout. Orders typically ship within 1-2 business days. Domestic US orders arrive in 3-7 business days via standard carriers; international delivery times vary by destination, typically 7-21 business days. All orders include tracking information. We partner with UPS, FedEx, and USPS to ensure reliable delivery of your precision instruments. For expedited options or specific shipping questions, contact our support team see our estimated delivery dates offered at checkout for each shipping selection.

Who manufactures Kestrel Instruments products and what is your company background?

Kestrel Instruments are manufactured by Nielsen-Kellerman, a leader in precision environmental measurement based in Pennsylvania, USA. Our partnership combines Nielsen-Kellerman's 40+ years of engineering expertise with Extreme Meters' commitment to delivering rugged, field-tested instruments to professionals worldwide. Together, we ensure every meter meets the highest standards for accuracy and durability.

What is your return policy?

We offer a 45-day return window from the date of purchase. Items must be unused, in original packaging, and in resalable condition. Return shipping is the customer's responsibility unless the item arrived damaged or defective. Once we receive and inspect your return, refunds are processed within 5-7 business days. For international orders, please contact our support team to discuss return options, as duties and shipping costs may apply. Damaged or defective items are eligible for replacement or full refund at no cost.

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