The Imagenex Model 881A Echo Sounder is a completely self-contained echo sounder with a serial output. It is mounted in a pressure-proof housing with an underwater connector for use in depths up to 3000 meters (10000 feet). It can be used as a standard echo sounder or with digitized first returns only. Its requirements are minimal, needing only a power source and a digital interface to an external device such as a personal or laptop computer.
该Imagenex模型881a回声测深仪是一种完全独立的回声测深仪的串行输出。它安装在一个用于深度达3000米的水下连接器的耐压壳体（10000英尺）。它可以作为一个标准的回声测深仪或数字化的第一只返回。其要求是最小的，只需要一个电源和数字接口到外部设备，如个人计算机或笔记本。