The Expendable Bathythermograph (XBT) is a device for obtaining a record of temperature as a function of depth in the ocean. They can be deployed from moving ships and from non-research vessels which broadens the situations in which they can be used.
The XBT consists of an expendable probe, a data processing and recording system, and a launcher. When the XBT probe is launched the wire connecting the probe and launcher unwinds as it descends through the water and provides data back to the vessel.
Updated: 27 November 2014