Qingdao Daowan Technology Co., Ltd. was established in October 2016, with its registered address at Unit 101, Building 14, Liandong U Valley, No. 285, Taishan Third Road, Jimo District, Qingdao City, Shandong Province. The company specializes in the research, development, production, sales, and technical services of high-precision temperature-salinity-depth meters.

Since its establishment, Dao Wan has gradually mastered all the core technologies of high-precision CTD (Conductivity, Temperature, and Depth) instruments through independent research and development, filling the domestic gap in CTD technology and providing Chinese users and even users worldwide with more and better choices.

The core components of the Dao Wan temperature-salinity-depth meter are all independently developed and produced or procured domestically, with key technologies being independently controllable. Its customers include well-known marine research institutions such as Ocean University of China, the 707th Research Institute of China State Shipbuilding Corporation, the 710th Research Institute of China State Shipbuilding Corporation, the 715th Research Institute of China State Shipbuilding Corporation, the 722nd Research Institute of China State Shipbuilding Corporation, the 760th Research Institute of China State Shipbuilding Corporation, the Institute of Acoustics of the Chinese Academy of Sciences, the National Marine Environmental Monitoring Center Station, Harbin Engineering University, the South China Sea Institute of Oceanology of the Chinese Academy of Sciences, the First Institute of Oceanography of the Ministry of Natural Resources, the Nantong Marine Environmental Monitoring Center Station of the State Oceanic Administration, the Ningbo Marine Environmental Monitoring Center Station of the State Oceanic Administration, the Zhuhai Marine Center of the Ministry of Natural Resources, and the Ningbo Ocean Research Institute. Currently, Dao Wan has sold thousands of units (sets) of products, saving tens of millions of yuan in research funding for domestic researchers and government departments.

Developing a high-precision thermohaline depth sounder for Chinese people is the original intention and belief of Dao Wan's establishment.Douwan has always remained true to its original aspiration and forged ahead with determination. Douwan's temperature and salinity depth gauge has gained increasing recognition from domestic users. With the concerted efforts of all colleagues in the company, we will surely break the foreign monopoly, establish a national brand, and make the world fall in love with Chinese marine instruments!