. . . . "accepted"@en . "SDN:L22::TOOL0950" . . "ES853" . "ES853"@en . "Scientific echo sounder with data logger. This single beam echo sounder operates at a frequency of 120 kHz with a maximum detectable range of 100 m and maximum operating depth of 1000m. It is of compact size and can be mounted on unmanned submersibles such as sea gliders, ROVs etc."@en . . "Imagenex 853 Echo Sounder"@en . . . . . .