Kestrel® 4300 Construction Weather Tracker

...At the World of Concrete, Kestrel Pocket Weather Meters introduced a very accurate handheld weather instrument weighing only a few ounces developed just for the concrete industry. If you hold the instrument 20 inches above the area to be concreted, it will record ambient conditions. When you enter the temperature of your concrete into the unit, it automatically calculates the rate of surface evaporation. Evaporation rates exceeding 0.20 tell you that surface drying conditions are excessive.
This information helps you know beforehand the risks. Then you have to decide what to do. Weather has such an influence on concrete. I urge you to manage your situation and not be victimized by it...

The Kestrel 4300 Construction Weather Tracker from Nielsen-Kellerman has been customized for construction professionals who place concrete. The rugged, waterproof tool measures and stores the evaporation rate; relative humidity; current, maximum and average wind speed; temperature; dew point; barometric pressure; heat stress index; wet bulb temperature; wind chill; altitude; and density altitude. It also allows for data charting.