Shenzhen Ruijing Environment Protection Technology Co., Ltd., located in the central city of Guangdong-Hong Kong-Macao Bay Area - Shenzhen, is a national high-tech enterprise, focusing on the research, development, production and sales of environmental analysis technology and environmental monitoring instruments. The company has a professional research and development, marketing and technical service team, a core technical backbone composed of doctors, masters and senior professionals, and more than ten years of research and development and technical service experience in the environmental monitoring instrument industry. The company has passed the certification of "GB/T19001: 2016/ISO9001: 2015 Quality Management System" and "GB/T24001: 2016/ISO14001: 2015 Environmental Management System", and can provide professional equipment, technical services and system solutions for the environmental protection industry. The company has independently developed a number of monitoring instruments such as fixed pollution source flue gas sulfur trioxide, ultra-low concentration particulate matter (or ultra-low dust), ultra-low concentration flue gas and ammonia escape, and has obtained a number of national invention patents and utility model patents, providing strong technical support for air pollution supervision and environmental governance. The environmental analysis and monitoring instruments developed and produced can be widely used in environmental protection, electric power, metallurgy, petrochemical, chemical, energy, transportation, scientific research and other industries.