salinity-temperature-depth recorder

salinity-temperature-depth recorder

[sə′lin·əd·ē ′tem·prə·chər ′depth ri‚kȯrd·ər]
(engineering)
An instrument consisting of sensing elements usually lowered from a stationary ship, and a recorder on board which simultaneously records measurements of temperature, salinity, and depth. Also known as CTD recorder; STD recorder.