The PWS100, manufactured in the UK by Campbell Scientific, Ltd., determines precipitation and visibility parameters for road, marine, and airport automated weather stations. A unique optical system and a laserbased light source allow the PWS100 to accurately determine the velocity and size of falling precipitation. Two separate detectors and laser-Doppler anemometry techniques improve upon current present-weather sensors and enable the PWS100 to accurately determine individual particle velocity and size to within 5 percent.

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