Never used standard meteorological radiosondes manufactured by VIZ
which is now Sippican, measures humidity, temperature, and barometric
pressure. These radiosondes have two transmitters. They use Loran C to
fix position and vector, and another transmitter at 403 Hz to transmit
humidity, temperature, and barometric pressure data. Come complete with
batteries, hygristors, and wire antennas for both transmitters. The
radiosondes would typically be flown on 600 to 1000 gram rubber or
latex balloons. We might be able to come up with an instruction sheet.
NASA surplus, left over from a project. According to the Disposal
Sheet, the original cost of each instrument was $300.

US$1,000 for all 40 pieces, plus shipping. Delivery available to North
Caronlina, Virgina, West Virgina, Maryland, Delaware, Pennsylvania, and
Washington DC for US$0.50 per loaded mile from zip code 23302.
Please email with any questions.