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Vaisala Ceilometer CL31 is a compact and lightweight instrument for cloud base height and vertical visibility measurements. It detects 3 cloud layers simultaneously. CL31 uses a pulsed diode laser LIDAR (light detection and ranging) technology. CL31 is ideal for aviation and meteorological applications.

Answer: Meters definitions by default, are stored in separate configuration file, called ceilometer/data/meters. d/meters.

A study group from Montreal, Canada in 2013 recommended that ceilometers should be installed "close to the landing threshold" for aerodromes with precision approach runways, but also considered their location "at the middle marker or at an equivalent distance" to be acceptable.

There are two basic types of ceilometers: the scanning receiver and the rotating transmitter.

Concern- ing costs, the cost of a ceilometer is around U.S. $ 30000, a microrain radar is approximately between U.S. $ 35000 and 100 000 depending on the automation/stand-alone capabilities included, whereas an S-band radar profiler is about U.S. $ 35000. A disdrometer costs between U.S. $5000–6000.

Several different types of ceilometers are used to measure cloud heights. They all shoot a laser beam up into the sky through a hole in the top of the cover. If there is cloud above the ceilometer, the cloud particles will reflect some of the beam, bouncing it back to the ceilometer.