Radiosonde
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A radiosonde is a battery-powered telemetry instrument carried into the atmosphere usually by a weather balloon that measures various atmospheric parameters and transmits them by radio to a ground rec
Modern radiosondes showing progress of miniaturisation
A GPS sonde, approx 220 × 80 ×75 mm (8.7 × 3.1 × 3 in) (with grounding station in the background, used to perform a 'ground check' and also recondition the humidity sensor)
Meteograph used by the US Weather Bureau in 1898
U.S. Bureau of Standards personnel launch radiosonde near Washington, DC in 1936
Dropsonde
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A dropsonde is an expendable weather reconnaissance device created by the National Center for Atmospheric Research, designed to be dropped from an aircraft at altitude over water to measure storm cond
Radiosonde
…reflectors and are technically rawinsondes. A radiosonde that is dropped from an airplane and falls, rather than being carried by a balloon is called a dropsonde. Radiosondes are an essential source of meteorological data, and hundreds are launched all over the world daily. The first flights of aerological…
Dropsonde delivery system on a NOAA P-3 Hurricane Hunter.
Dropsonde (source US Air Force)