The Neptune Model 395 Single Frequency Transducer concentric element arrangement generates a conical beam pattern with low side lobes. The frequencies selected for the 395 Series are compatible with a wide range of echo-sounder types, in particular the 33 kHz version is an exact equivalent for the Atlas SW 6028. The Neptune Model 395 Single Frequency Transducer are manufactured using the latest NEPTCAST® polyurethane moulding system. This technique provides a mechanically robust, corrosion free transducer, suitable for tank, thru-hull or over-side mounting. The versatility of the design is further enhanced with the option of a ground discrimination ‘GD’ feature providing an indication of the sea bed roughness.