Drying Ovens are divided into the fan-blown type electric drying oven and the vacuum drying oven. The electric drying oven is an oven with an air circulation function to dry materials containing water by electrical heating. The vacuum drying oven is an instrument that provides a vacuum environment to dry heat-sensitive, easily decomposed and oxidized materials. A vacuum pump vacuums the working chamber before drying. It is allowed to be filled with inert gas if necessary. Both drying ovens are widely applicable to chemical products, electronics, plastics, cables, hardware, automobile parts, rubbers, print products, medical products, etc.