depth finder for determining depth of water or a submerged object by means of ultrasound waves
例句
The paper briefs the basic principles of the fathometer and its application to submerged landform measurement near a planned large dock out of the Hangzhou Bay. 本文在介绍回声测深仪基本工作原理的同时，介绍了回声测深仪在杭州湾口外一拟建大型码头水下地形测量的一个应用实例。
digital electromagnetic fathometer 数字电磁测深仪
Practice for Calibrating a Fathometer Using a Bar Check Method 用棒测法校准回声测深仪的操作规程
Standard Practice for Calibrating a Fathometer Using a Bar Check Method 用棒检验方法对回声测深仪的标准操作规程
