"Vaisala Present Weather Detector PWD22"@en . . "SDN:L22::TOOL1007" . "Vaisala Present Weather and Visibility sensor PWD22 is a compact and light-weight probes that provide accurate measurements of prevailing visibility. This sensor is able to measure visibility between 10m and 20,000m and is able to indicate the cause of prevailed visibility and detect precipitation type and rain accumulation"@en . .