Features & Applications:

The new Kestrel 4300 Construction Weather Tracker measures and displays evaporation rate - a function of relative humidity, temperature and wind speed. Evaporation rate is a critical environmental indicator that concrete contractors use to ensure they avoid plastic shrinkage cracks in concrete installations especially concrete flatwork. Plastic shrinkage cracks occur when the surface of the concrete dries too quickly and shrinks before the bed has cured enough to resist cracking. This is especially relevant in specialty applications like decorative concrete, Ready Mix Concrete (RCM) and Tilt-up concrete.

Plastic shrinkage cracks can be avoided by correctly assessing the weather and the fresh concrete conditions. Before the Kestrel Meter was introduced, construction contractors used an American Concrete Institute chart to calculate the evaporation rate. The Kestrel 4300 Construction Weather Tracker now does all of the work for them. To use the tracker, the user enters the concrete temperature, which is obtained through an infrared thermometer or a probe thermometer. The 4300 will then calculate the evaporation rate instantly. The tool can also measure and log relevant weather conditions from the job site. Use the Kestrel averaging mode to get the average evaporation rate for 6-10 seconds.

For maximum accuracy when measuring the evaporation rate:

1. Measure the concrete temperature via an infrared or probe thermometer
2. Enter the concrete temperature into the Kestrel
3. Position the unit facing into the wind, 20 inches above the concrete
4. Shade the Kestrel's thermistor (temperature sensor) so it is not in direct sunlight

For the best accuracy, use the Kestrel's convenient averaging mode to average the evaporation rate over the recommended 6-10 seconds.

Features:

• Waterproof and floats
• Backlight for low light conditions
• Data logger (automatic and manual)
• Customizable data storage – 1800 data points
• Multi-Function 3-line display
• Convenient averaging mode
• Data charting
• User-replaceable impeller
• Flip-top impeller cover
• Five languages (English, French, Spanish, German, and Italian)
• Assembled in the USA

Includes:

• Soft carry pouch
• Wrist and neck lanyards
• Batteries – 2 AAA
• Kestrel Certificate of Conformity