The set of transducers (2 pcs.) is used with the PULSAR-2.1...2.2 instruments for surveying of the underwater part of the hydraulic structures, as well as for other cases, which demand the washdown version of the transducer. The transducers require special cables with the hydro-insulated connectors for the transducer. The conical nozzles for the point contact with the tested object are not included in the standard package of the transducer.