Kestrel 4300 Construction - DISCONTINUED

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Vendor Kestrel

Kestrel Meter 4300 Construction Weather Meter


** Discontinued as of December 1, 2015. The newly released Kestrel 5200 essentially replaces the 4300.  It has the same and some added functions with some physical and connectivity improvements.  

Here is a VIDEO showing the 4000 series vs the new 5000 series


For Historical Reference, here is information on the discontinued Kestrel 4300:


The Kestrel 4300 Construction Weather Tracker was the first Kestrel wind and weather meter designed specifically for construction professionals, especially those who work with concrete and other materials that require curing. The evaporation rate function made the Kestrel 4300 the ideal wind and weather meter for concrete contractors. In addition, the 4300's long list of weather tracking capabilities put instant and accurate environmental data right in the palm of your hand. The Kestrel 4300 was available with or without Bluetooth Technology to transmit data wirelessly. The Kestrel 4300 Construction Weather Tracker had all the features of the Kestrel 4000, plus evaporation Rate (for measuring concrete moisture) 

Here's a great article discussing Evaporation Rate.  Page 4 describes the methodology for the calculations.

How to Prevent Plastic Shrinkage Cracks

Before the introduction of the Kestrel 4300, concrete contractors would employ a Kestrel Meter to measure the surrounding conditions, then calculate the evaporation rate of a pour by referencing the American Concrete Institute (ACI) chart. The Kestrel 4300 measured the evaporation rate of concrete automatically by calculating the temperature of the concrete (obtained with a concrete thermometer or IR) with the relative humidity, ambient temperature, and wind speed.   

It's really that simple and took seconds to get your evaporation rate.  You entered the concrete temperature on the Kestrel 4300.  Take a wind speed, the meter allows you to take an average over time.  Get a reading of the environmental conditions while its shaded, use a paper, your body, or just a clip board over the unit, so you don't let radiant heat effect the readings.... Then the evaporation rate will be calculated instantly.  It was that easy. 

The Kestrel 4300's usefulness on a job site is hardly limited to measuring the evaporation rate of concrete or preventing plastic shrinkage: Wind speed functions are invaluable for crane operations; heat index keeps close tabs on working conditions; humidity measurement for paint and drywall; pressure trend can warn of impending storms; the list goes on. 

Every 4000 series Kestrel Meter stored thousands of weather data points - tracking minimum, average, and maximum values - and graphs the trends for you. 

If you have the 4300 with Bluetooth, it included custom communication software designed to quickly and easily configure your data transmission frequency, download logged data, graph data and transfer data to other applications. It was not necessary to purchase an interface separately, the Kestrel Meters with Bluetooth include the software necessary to communicate wirelessly at a range of up to 30-feet.

See out the Kestrel Portable Tripod, the perfect companion for the Kestrel 4300. At 15" tall, the tripod positions the 4300 at the recommended 20" above concrete.   

The Kestrel Meter 4300 Construction Weather Meter measures/features

  • Waterproof
  • Backlight for low light conditions
  • Data logger (automatic and manual)
  • Customizable data storage – 3600 data points
  • Multi-Function 3-line display
  • Convenient averaging mode
  • Data charting
  • Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
  • User-replaceable impeller
  • Flip-top impeller cover
  • Upload to a computer (with optional interface)
  • Five languages (English, French, Spanish, German, and Italian)
  • US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
  • Assembled in the USA

Kestrel Meter 4300 Construction Weather Meter Includes

  • Soft carry pouch
  • Neck lanyard
  • Batteries – 2 AAA*


Historical Facts:


  • Sold for $259 Non Bluetooth, $349 with Bluetooth
  • Was available in Green only
  • Discontinued in December 2015


    *We ship every Kestrel 4000 Series Meter exclusively with Made in the USA Energizer® Brand Ultimate Lithium AAA batteries for improved reliability, capacity, cold-weather performance and weight. We strongly recommend that you use only Energizer Ultimate Lithium batteries in your Kestrel Meter. If you choose to install alkaline batteries, we recommend that you do NOT store your Kestrel with these batteries installed, and that you check your batteries for leakage and corrosion a minimum of every 30 days. Damage due to leaking alkaline batteries is not covered under warranty.

    Kestrel Meter 4300 Additional Information 

    Unboxing the Kestrel 4000 Series

    Can We Kill a Kestrel in the Freezer?