Construction professionals have been using Kestrel Meters for years to monitor local weather conditions, as it's not only important for worker and equipment safety but also to ensure good results with processes like surface coating and concrete pouring. The new Kestrel 4300 Construction Weather Tracker, NK's latest specialty Kestrel meter, 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 cracking of expensive concrete installations. Plastic shrinkage cracking occurs when the surface of the concrete dries too quickly and shrinks before the bed has cured enough to resist cracking.

Previously, construction foremen have employed a Kestrel Meter to measure the relevant conditions, then referenced an American Concrete Institute chart to calculate the evaporation rate. The new Kestrel 4300 Construction Weather Tracker does the work for them! The user simply enters the concrete temperature (obtained via an IR or probe thermometer) and the 4300 calculates the evaporation rate instantly. In addition to evaporation rate, the Kestrel 4300 remains the perfect rugged all-purpose construction weather tool, measuring and logging the following relevant weather conditions right where the workers and equipment are operating.

• Evaporation Rate
• Barometric Pressure & Trend
• Altitude & Density Altitude
• Relative Humidity & Dew Point
• Wind Chill & Heat Stress Index
• Wet Bulb Temperature
• Air Temperature
• Current & Average Wind Speed
• Maximum Wind Gust
• One-button clear and restart of Max Wind Gust and Average Wind measurement`
• Waterproof & Floats
• Manual data capture
• Automatic Data Storage
• Customizable Data Storage - 1800-point data logger with graphical display for each measurement variable
• Auto data storage interval settable from 2 seconds to 12 hours
• Minimum, maximum, average and logged history stored and displayed for every measured value
• Data Upload with optional PC interface and provided software
• Optional RS-232 connection with USB adapter available
• Electroluminescent backlight with automatic or manual activation
• Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment
• User-selectable auto shutdown: 15 or 60 minutes with no keypresses or disabled
• Data Charting
• Five Languages: English, French, Spanish, German, and Italian
• User-replaceable Impeller
• Flip-top Impeller Cover
• Soft Carry Case
• Wrist and Neck Lanyards
• Five-year warranty from the manufacturer

• Wind Speed (sample every 1 second)
  • 0.4 to 60 m/s (0.1 resolution, 3% accuracy)
  • 59 to 11,948 ft/min (1 resolution, 3% accuracy)
  • 1 to 218 km/h (0.1 resolution, 3% accuracy)
  • 0.8 to 135 mph (1 resolution, 3% accuracy)
  • 0.6 to 118.3 kt (0.1 resolution, 3% accuracy)
  • 0 to 12 Beaufort (0.1 resolution, 3% accuracy)
• Air Flow (sample every 1 second)
  • 0 to 99,999 cfm (1 resolution, 3% accuracy)
  • 0 to 99,999 m3/h (1 resolution, 3% accuracy)
  • 0 to 99,999 m3/m (1 resolution, 3% accuracy)
  • 0.0 to 9,999.9 m3/s (0.1 resolution, 3% accuracy)
  • 0 to 99,999 L/s (1 resolution, 3% accuracy)
• Temperature (sample every 1 second)
  • -20.0 to 158.0 °F (0.1 resolution, 1.8 °F accuracy)
  • -29.0 to 70.0 °C ( 0.1 resolution, 1.0 °C accuracy)
• Evaporation Rate (sample every 1 second)
  • 0.00 to 1.00 lb/ft2/hr (0.1 resolution, ±0.02 lb/ft2/hr accuracy)
  • 0.00 to 5.00 kg/m2/hr ( 0.1 resolution, ±0.1 kg/m2/hr accuracy)
• Relative Humidity (sample every 1 minute)
  • 0.0 to 100.0 % (0.1 resolution, 3.0 %RH accuracy
• Barometric Pressure (sample every 1 second)
  • 8.86 to 32.48 inHg
    (0.01 resolution, 0.05 inHg accuracy)
  • 300 to 1100 hPa / mb
    (0.1 resolution, 1.5 hPa / mb accuracy)
  • PSI (0.1 resolution)
• Altitude ( sample every 1 second)
  • -6000 to 30000 ft (1 res, 50 ft accuracy)
  • -2000 to 9000 m (1 res, 15 m accuracy)
• Wind Chill (sample every 1 second)
  • -49.0 to 257.0 °F (0.1 resolution, 1.8 °F accuracy)
  • -45.0 to 125.0 °C (0.1 resolution, 1.0 °C accuracy)
• Heat Index (sample every 1 minute)
  • 0.0 to 100.0 %RH, -49.0 to 257.0 °F
    (0.1 resolution, 3.6 °F accuracy)
  • -0.0 to 100.0 %RH, -45.0 to 125.0 °C
    (0.1 resolution, 2.0 °C accuracy)
• Dew Point (sample every 1 minute)
  • 0.0 to 100.0 %RH, -49.0 to 257.0 °F
    (0.1 resolution, 3.6 °F accuracy)
  • 0.0 to 100.0 %RH, -45.0 to 125.0 °C
    (0.1 resolution, 2.0 °C accuracy)
• Wet Bulb (sample every 1 minute)
  • -49.0 to 257.0 °F, 0.0 to 100.0 %RH,
    8.86 to 32.48 inHg
    (0.1 resolution, 3.6 °F accuracy)
  • -45.0 to 125.0 °C, 0.0 to 100.0 %RH,
    300.0 to 1100.0 hPa
    (0.1 resolution, 2.0 °C accuracy)
• Density Altitude ( sample every 1 second)
  • FT: -49.0 to 257.0 °F, 0.0 to 100.0 % RH,
    8.86 to 32.48 inHg (1 res, 246 accuracy)
  • M: -45.0 to 125.0 °C, 0.0 to 100.0 %RH,
    300.0 to 1100.0 hPa (1 res, 75 accuracy)
• Power requirements: 2 AAA Alkaline batteries (included)
• Battery life: ±400 hours, depending on backlight use

• 5.0" x 1.8" x 1.1" (12.7cm x 4.5cm x 2.8cm)

...and many more!

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