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The initial development and testing of a small in-situ conductivity instrument was reported at OCEAN '73 . Since then, extensive operational experience has been obtained with a number of these instruments on moorings and on free and tethered platforms that move vertically and horizontally. This experience is reported here; as well as design improvements, and calibration and maintenance procedures. Also discussed are cell-flushing characteristics and the problems of matching conductivity measurements spatially and temporally to temperature measurements.