Oven is a heating device in the laboratory. It is commonly used for uniform and long-term heating and constant temperature of an object. For example, in bacterial culture using Qiongzhi, sometimes the overall growth temperature is raised to a state of optimal reproduction, in order to shorten the time required for bacterial culture. It is also commonly used in laboratories for drying and cleaning objects. It has a wide range of applications. Most temperatures range from 30 ℃ to 300 ℃. For some special occasions, some ovens are also equipped with vacuum pumps for pressure reduction. For example, vacuum defoaming of plastics, removal of engine oil, and so on.