Shenzhen Changhong Technology Co., Ltd. (referred to as "Shenzhen Changhong") was established in 2002 and became a high-tech enterprise in Shenzhen in 2018. For the past eighteen years, we have been committed to the research and development, production, and sales of over a hundred water quality monitoring instruments, including COD analyzers, ammonia nitrogen analyzers, total phosphorus analyzers, total nitrogen analyzers, water quality heavy metals, inorganic compounds, and more. Our product technology involves computer, microcontroller software and hardware, optics, chemical analysis, and other technical fields. At present, the company mainly produces products such as COD analyzer, ammonia nitrogen analyzer, total phosphorus analyzer, total nitrogen analyzer, turbidity meter, residual chlorine analyzer, copper, iron, nickel, zinc, hexavalent chromium, nitrite, cyanide, sulfide, iodide, volatile phenol, hydrazine, aniline and more. It also produces instruments for measuring physical parameters in water such as pH, conductivity, dissolved oxygen, turbidity, chromaticity, and total hardness. Our company's products have been sold to various parts of the world, with over 8000 domestic customers located in more than 20 provinces, municipalities, and autonomous regions across the country. We have also exported to countries such as Thailand, Indonesia, Singapore, and Europe and America, with a total of over 100000 customer partners. We have established a good reputation among our customers and have become a leading enterprise in the domestic water quality testing instrument industry with the most complete variety, stable product quality, and excellent comprehensive performance indicators. The "Shenchanghong" brand has also become a well-known brand for independently producing water quality testing instruments in China. The company has been focusing on product quality management and new product development for many years. The stability, repeatability, and operability of its core products are leading in China, and its comprehensive performance is close to or even partially surpasses the most well-known foreign brands. More than 8 new R&D products are launched every year. The company's sales are steadily occupying the market with an annual growth rate of over 30%. Shenchanghong is creating the first brand of laboratory water quality testing instruments in China through "active innovation, quality priority, continuous improvement, and steady progress".