Beijing Shuanghui Jingcheng Electronic Products Co., Ltd. was established in 2001 and is located in the Zhongguancun Incubator Youth Entrepreneurship Park. At the beginning of its establishment, the company was focused on the research and development, production, and sales of high-performance, high-tech integrated water quality measuring instruments. The company relies on universities and possesses high-tech talents in computer software and hardware development, intelligent instrument design, microcontroller application, sensor design and application, CNC equipment design, PCB design, and other fields. Beijing Shuanghui Jingcheng Electronic Products Co., Ltd. specializes in the development and production of water quality and environmental monitoring instruments. Currently, it is one of the domestic product manufacturers with technological level and scale strength. In 2001, the independently developed and produced water quality analyzer integrating measurement, calculation, and colorimetry was introduced to the market. Quickly gained market recognition. Changed the previous situation in the market where only digestion devices were more convenient, while a large number of measurement results still required the use of photometers and manual calculations. In 2002, the 12V power supply method was applied to water quality measuring instruments in the industry. COD (Chemical Oxygen Demand) analyzer, NH3 analyzer, multi parameter water quality analyzer, turbidity colorimeter, and aquaculture analyzer are all independently developed and manufactured by our company. And it complies with the environmental protection industry standard HJ/T 399-2007 of the People's Republic of China and the "Water and Wastewater Monitoring and Analysis Methods" (Fourth Edition) published in 2002, which includes the rapid closed catalytic digestion method (including photometric method). This method is classified as a Class B method. After in-depth research and multiple laboratory validations in China, it has been proven to be a mature unified method. Both Class A methods can be used in environmental monitoring and law enforcement. Our company's COD analyzer is the only recommended product. In 2005, a multi parameter measuring instrument with proprietary intellectual property rights in the industry was developed, integrating more than 30 indicators for digestion measurement, greatly reducing the procurement and usage costs for end users. Quality and service are the core of an enterprise, and improving product quality and service is the core work of every Shuanghui Jingcheng employee. The principle of "based on industry, integrity-based, customer first, and service-oriented" is our policy towards customers, and providing high-quality products and services is our long-term goal! Our company sincerely seeks partners and supports the use of OEM methods to provide preferred products for foreign users. We can provide customized products that meet user requirements based on their provided appearance, color, language, and functionality. Welcome sellers from various countries to cooperate with our company.