The PWS100 is a laser-based sensor that measures precipitation and visibility by accurately determining the size and velocity of water droplets in the air. It can be used in weather stations in road and airport applications. The PWS100 uses advanced measurement techniques and algorithms to calculate individual precipitation particle type. For aviation appplications, users can be assured that the PWS100 complies with CAA and ICAO guidance and meets or exceeds all recommendations and specifications. (This includes CAP437, CAP670, and CAP746.) ICAO compliant frangible masts are available for aviation use. To enhance the PWS100 algorithms, Campbell Scientific recommends adding a CS215-PWS Temperature and Relative Humidity Probe (listed on the Ordering Information page under Common Accessories), which will cause the data from the CS215-PWS to be fed directly into the PWS100 precipitation type and visibility algorithms. Note: Campbell Scientific does not recommend using the PWS100 for marine applications.