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The instrument was originally developed by the Applied Physics Laboratory, University of Washing-The initial development and testing of a small ton,+ and is now commercially available from Seain-situ conductivity instrument was reported at Bird Electronics (under license from the University OCEAN 73.l Since then, extensive operational ex-of Washington) as Model SBE-4 ( Figure 1).perience has been obtained with a number of these instruments an moorings and on free and tethered ~ ~~~ ~~ . = ~~ ~ ~ ~ platforms that move vertically and horizontally. ~~~~