After dozens of field tests, Hydro-Tech learnt much and gained abundant experience. Then we decided to design a portable and low-power multibeam echo sounder suitable for high mountains, no man land, reservoirs, lakes and other areas of the water resource industry. With the compact and multi-function design, it has truly become a powerful tool for water resources surveying and mapping. Up to now, Hydro-Tech products have been utilized by the South-to-North Water Diversion Center of the Ministry of Water Resources and other Provincial Water Resources Planning Institutes.