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Optional software module adds specialized reports for farmers, growers, and turf managers. With a user-defined 24-hour period and growing season, you can track the weather according to your needs, not the calendar's. You'll get evapotranspiration, chilling requirement, leaf wetness hours, and soil temperature hoursùall with user-entered thresholds and starting and ending dates. Plus growing degree-days and temperature-humidity hours (with user-entered names of crops, pests, or diseases) and crop water management (with irrigation values and user-entered K-factor profiles). For use with WeatherLink models 6510SER, 6510USB, 6540, 6550, 6560, or 7862. Some reports require the use of optional sensors. Not for use with WeatherLink for Mac 6520. For owners of GroWeather who wish to upgrade to Vantage Pro2, includes the ability to import files from GroWeatherLink.