There are professional raw material procurement agency partners who can purchase the required raw materials efficiently and at low prices to ensure the quality of raw materials, in addition to reasonable arrangements for the production process, improve the utilization rate of equipment, and use materials, Improvement of operating procedures, production conditions, etc., increase labor productivity, reduce labor consumption per unit of product, and at the same time establish the concept of "improving quality and reducing cost", reducing waste loss, product after-sales maintenance costs and other intangible losses, through various channels and methods Carry out scientific and standardized control of costs, reasonably save costs, reduce product market prices, and improve product cost performance under the premise of ensuring laboratory dissolved oxygen meter quality remains unchanged.