Yantai dongrun instrument Co Ltd, was established on March 3, 1998, specializing in environmental analytical instruments, (hydraulic) instruments two main categories of research and development, production, sales and service. Company and CAs coastal Institute joint build "photoelectric monitoring technology laboratory", cooperation development has fluorescent law dissolved oxygen instrument, smart TOC, and COD, and BOD Analyzer, online ammonia nitrogen, and total nitrogen Analyzer, heavy metal ion Analyzer, products; introduced Germany, and Japan, abroad key technology and key parts autonomous development of online PH/ORP meter, and conductance rate, and acid alkali salt concentration meter, and online turbidity "SS meter", and online over chlorine total chlorine Analyzer, and microwave radar property bit meter, and magnetic to telescopic liquid bit meter, and RF (substance), liquid level gauges, magnetic pole products such as liquid level gauge. Dongrun products are widely used in chemical, petrochemical, pharmaceuticals, environmental protection, water treatment, non-ferrous metallurgy, textile, steel and other industries, exports of Korea, and India, Pakistan, Iran, and Syria, Zambia, Malaysia, more than a dozen countries, the majority of users at home and abroad.