Shandong Dongrun Instrument Technology Co., Ltd. (formerly known as Yantai Dongrun Instrument Co., Ltd.) was established in March 1998. It mainly engages in the research and development, production, and sales of water environment online monitoring instruments and level instruments, as well as the development of computer IoT software and the design, integration, and service of system engineering. The company currently holds over 70 national patents and software copyrights; Belonging to the national "high-tech enterprise" and the "double soft certification enterprise" of the Ministry of Industry and Information Technology; Approved the establishment of the "Shandong Province Water Environment Monitoring and Analysis Engineering Technology Research and Development Center" and the "Shandong Province Enterprise Technology Center"; Passed the certifications for Quality, Environment, Occupational Health and Safety Management System, Measurement Management System, and Intellectual Property Management System; Obtained the "Level 3 Qualification for Information System Integration and Service" and the "Level 2 Qualification for Electronic and Intelligent Engineering Professional Contracting". Dongrun Instrument has a strong technical force, with over 40% of its employees being high and intermediate level technical talents. The company has established multidisciplinary laboratories in optics, electronics, physics, chemistry, biology, and other fields. It has also established strategic partnerships with well-known universities and research institutes both domestically and internationally, and has set up a professional center for information technology software and sensor design and development. The company has undertaken multiple national, provincial, and municipal scientific and technological research projects, and some of its technologies have filled domestic gaps. The company has a series of products with independent intellectual property rights, including online TOC/BOD/COD/ammonia nitrogen/total phosphorus/total nitrogen analyzers, fluorescence dissolved oxygen analyzers, multi parameter water quality analyzers (pH, ORP, conductivity, salinity, residual chlorine, turbidity, dissolved oxygen, sludge concentration, temperature, etc.), water quality automatic monitoring stations, magnetostrictive level gauges, magnetic flap level gauges, radar level gauges, radio frequency admittance level gauges, etc. The product quality is stable and reliable; At the same time, the company has introduced and innovated photoelectric in-situ online monitoring products such as full spectrum multi parameter analyzer, online chlorophyll, blue-green algae, chromaticity, and water oil analyzer, as well as biological online monitoring instruments such as biotoxicity and Escherichia coli analyzer. Among them, water quality analyzers such as ammonia nitrogen, total phosphorus, total nitrogen, chemical oxygen demand analyzer, pH meter, and surface water routine five parameters have obtained environmental certification. The DR5000 water quality online multi parameter analyzer has obtained Shandong Province's high-quality brand certification, and the fluorescence dissolved oxygen analyzer has been selected as a famous brand product in Shandong Province. The company has developed a water resources monitoring and scheduling management platform, which includes online monitoring systems for surface water, drinking water, aquaculture, sewage, marine ecological environment, etc. It can provide users with a comprehensive solution for automation and information management, and can provide personalized design services according to customers' special requirements. Dongrun's products and services are widely used in water supply and drainage, water engineering, environmental monitoring, municipal engineering, water treatment and other industries. They are sold to provinces, cities and autonomous regions throughout the country, and exported to more than 40 countries, including Europe, the United States and the the Belt and Road, and are well received by users at home and abroad. Dongrun Instrument has always adhered to the principle of "being a virtuous person and creating a national brand", with the goal of meeting user requirements, guided by "leading technology and win-win cooperation", striving for excellence, exploring and innovating, and striving to continuously improve the efficiency and benefits of users and the human living environment.