A ceilometer is a device that uses a laser or other light source to determine the height of a cloud base. Ceilometers can also be used to measure the aerosol concentration within the atmosphere. They can sometimes be fatal to birds, as the animals become caught in lightbeams and suffer exhaustion and collisions with other birds. In the worst recor...
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http://en.wikipedia.org/wiki/Ceilometer
instrument for measuring height of cloud ceiling above earth
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http://phrontistery.info/c.html
device for measuring the height of cloud bases. One important use of the ceilometer is to determine cloud ceilings at airports. The device works day ...
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http://www.britannica.com/eb/a-z/c/41
A device used to evaluate the height of clouds or the vertical visibility into a surface-based obscuration.
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http://www.encyclo.co.uk/local/22268
an automatic device for measuring and recording the height of clouds by projecting a modulated beam of light onto a cloud base, receiving the reflection of light through a photoelectric apparatus, and computing the height by triangulation.
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https://www.infoplease.com/dictionary/ceilometer
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