The Vaisala PWD21 present weather detector measures the current weather conditions at its location. The instrument detects the attenuation and scattering of a light beam to determine most reported properties. It also has a capacitative sensor for measuring precipitation. The PWD21 was originally operated at the CFARR field station at Sparsholt College over the period January 2005 to May 2007. It has been in operation at the main CFARR Chilbolton Observatory site since August 2009.
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