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Instrument: CEILOMETERS
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Description
Ceilometers are devices using a laser or other light source to
determine the height of a cloud base. An optical ceilometer uses
triangulation to determine the height of a spot of light
projected onto the base of the cloud; a laser ceilometer
determines the height by measuring the time required for a pulse
of light to be scattered back from the cloud base.

Additional information available at
http://www.wikipedia.org/wiki/Ceilometer