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About the Visual
meteorological measuring instruments
Technique used to measure the pressure, temperature and humidity of air as well as wind speed and wind direction at various altitudes.
See upper-air sounding in :
Pressurized balloon equipped with measurement instruments used to collect atmospheric data (up to an altitude of 30 km), which it then transmits to the ground by radio signal.
Instrument composed of sensors that measure the pressure, temperature and humidity of air; it then relays the data to ground level using a radio transmitter.
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