We describe a measuring transducer of electrical conductivity of liquids, used both under laboratory conditions and also for the study of ocean processes (under natural conditions). The transducer is represented in the form of a separate unit for laboratory investigations, which can be used as part of a deep-water hydraulic probe. For an example of different processes and flows, at the IPMekh RAN laboratory of fluid mechanics it has been shown that a small-scale transducer has a high speed and high spatial resolution.