| The contributing cause was that the ceilometer manufacturer had made a slight change in the design of a component. |
| The ceilometer uses a laser to measure the cloud base height. |
| Reflections of this light from the base of the clouds are detected by a photocell in the receiver of the ceilometer. |
| Our ceilometer observations of large numbers of birds near crests of ridges are particularly relevant in that regard. |
| The scanning-receiver ceilometer has its separate light transmitter fixed to direct its beam vertically. |
| Earlier, the DWD had already opted for the cloud ceilometer from the Fellbach-based company. |
