Clear Imaging: Lens coating, high light transmittance, high refractive index, the image is brighter and clearer. Material: The mirror body is made of all metal material, with fine workmanship and quality assurance. Wide Field of Vision: More comfortable viewing, the lens will not corrode, bloom, and have a long service life. Standard Interface: The diameter of the interface is 30mm, and the stereo microscope with the same diameter can be used. Uses: Suitable for using eyepieces on continuous zoom stereo microscopes.