The Vaisala CL31 ceilometer measures the cloud height in three layers using a pulsed laser diode LIDAR technology. The measurement range is 7600 meter and measures the the cloud coverage in oktas using the built-in sky condition .
The Vaisala HMP155 temperature and humidity sensor provides reliable outdoor temperature and humidity measurements. The sensing elements are protected with a sintered teflon filter for protection against water and dirt. The HMP155 is normally installed in a DTR503 solar radiation screen.
The Vaisala PWD family offers a range of visibility instruments. The PWD uses a optical forward scatter to measure the visibility with a range of 2000 meters for the PWD12 and 20 000 meters in the PWD22. The present weather is available in SYNOP code format.