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Silicon photo diode provides good match to solar spectrum. Quick Guide (pdf)Owner's Manual (pdf). Includes built-in level and 2' (0.6M) cable. Solar Radiation Sensor. You may also need a UV Sensor (#6490) and Sensor Mounting Shelf (#6673).
The solar radiation greatly increases the usefulness of the Davis weather station as it allows the system to calculate evapotranspiration rates and thereby calculate irrigation/watering needs. It is affordable unlike the UV sensor that has much less utility.