<B>Solar Radiation Sensor</B><br><br>For use with Vantage Pro and Vantage Pro2. (Already included with Vantage Pro Plus and Vantage Pro2 Plus.)Measures solar radiation and is required (along with an anemometer and a temperature/humidity sensor) if you wish to monitor evapotranspiration.<br>Diffuser element and housing are carefully designed for accurate cosine response. Silicon photo diode provides good match to solar spectrum. Two-piece housing minimizes radiation heating, allows convection cooling of the sensor, and prevents the trapping of water or dust. Includes built-in level and 2' (0.6M) cable.<br><br>Compatible with both original Vantage Pro and Vantage Pro2.<br><br>You may also need a UV Sensor (#6490) and Sensor Mounting Shelf (#6673). <!--- cis2:m2lumJ1t --->