derinlik ölçücü

listen to the pronunciation of derinlik ölçücü
Türkçe - İngilizce
fathometer
A depth finder that uses sound waves to determine the depth of water

A Fathometer is just a vertical echo-ranger; its pings would sound the same and could drive a submarine out of position just as effectively as horizontal echo-ranging and might even make a contact.

{i} instrument for measuring underwater depth using sound, sonic depth finder