With light mirror is widely used in pipelines, equipment and important accessories. The mirror is mainly composed of a mirror plate, mirror glass, fasteners, seal component. Lighting mirrors are generally installed in pressure vessels, vacuum vessels, tanks, reactors, filters, boiling beds and other tanks and sealed containers. They can observe the internal conditions of the container under the same pressure and temperature conditions as the container. They can also be used in chemical towers with high temperature, strong corrosiveness, easy poisoning, high risk and easy crystallization to ensure their safety in production. When observing the dim environment, it is necessary to configure the eyepiece spotlight, which is divided into explosion-proof and anti-corrosion forms.