As one of the company's core businesses, after years of technical research and development and accumulation, we have independently developed nearly 100 kinds of quality control products and secondary standards with different matrices, which can cover the needs of different detection fields. Our products have been valued by different instruments and laboratories, and the market segments include clinical testing, cosmetics testing, food and health care products testing, environmental testing and other fields. These products have been widely used in China Institute for the Control of Food and Drugs, the Clinical Inspection Center of the Ministry of Health, the National Risk Assessment Center, and the Center for Disease Control and Prevention.