ceilometers
/siːˈlɑːmɪtərz/
noun
- Instruments that measure the height of clouds or the ceiling of the sky, used in meteorology and aviation.
- Modern ceilometers use laser beams to measure the distance to the cloud base.
- The airport uses ceilometers to determine when it is safe for planes to take off.
- Meteorologists rely on ceilometers to get accurate cloud height data for weather forecasts.