About the PR-70
Ceiling balloons, also know as pilot balloons, are a great tool often used to determine cloud base height. These meteorological balloons are available in a variety of colors for easy visual tracking in various weather conditions. Other applications of ceiling balloons include wind direction research and wind speed studies. Often the ascent rate of these weather balloons can be tracked using optical instruments such as a theodolite. Ceiling balloons have been a very important tool in upper air observations.