A culture dish is a laboratory vessel used for microbial or cell culture. It consists of a disk-shaped bottom and a cover, and is basically made of glass or plastic. Glass is mainly used for plant materials, microbial culture and adherent culture of animal cells. Most of the plastics are made of polyethylene materials, which are disposable and reusable. They are suitable for the operation of inoculation, scribing and bacteria separation in the laboratory, and can be used for the cultivation of plant materials. In 1887, a German scientist named Julius Richard Petri developed a shallow nested disk for laboratory experiments. Before the invention of petri dishes, scientists used test tubes, empty wine bottles and other types of glass jars to culture culture. Unlike these glass containers, the lid of the petri dish is firmly covered on the petri dish, which can well protect the internal culture. In view of the multifunctional characteristics of petri dishes, they are one of the most common equipment in the laboratory. It not only provides an excellent environment for the growth of bacteria, yeast, mold and virus, but also has other uses. They can also be used to observe the behavior of insects, observe the germination of seeds, store samples and evaporate solvents. Petri dish is one of the most important discoveries in the 20th century, and the most well-known one is the discovery of penicillin. Alexander Fleming, professor of bacteriology at St Mary's Hospital in London, was widely praised for the discovery of penicillin in 1928. Noke mainly provides sterilized petri dish that are relatively common in the market, including 6cm, 9cm (2/3/4 rooms) and other specifications. Because the reproduction, growth and development of microorganisms are directly related to the culture medium (nutrition) provided, especially the quantitative analysis, it is of decisive significance to the amount of nutrients provided. Therefore, from the comprehensive consideration of the provision of nutrients, the countable area of colonies, the convenience of operation, and the cost of use, At present, 9cm petri dishes are the most widely used. The bacterial culture dishes are all produced in a 100000 level purification workshop and have been inspected for many times. They are clean and safe, EO sterilized, and free of DNase, RNA enzyme and heat source. The thickness shall be uniform, the surface shall be flat, and free of stains, pits, bubbles, pits, scratches and other defects. The transparency of highly transparent polystyrene should ensure that the substances in the container can be clearly observed and the material is stable. The vent design of the petri dish cover is conducive to gas exchange, and the survival rate of bacteria is high. The convex part minimizes the edge effect. The stacking ring makes stacking and handling easier.