... first service with best LZJ-6E dental and ENT operating microscope with 1, the primary mirror, the optical tube ... / 18B5, large objective lens focal length: 250mm (optional 200,300,350,400)6, cold light source fiber optic coaxial illumination ... 50Hz or 110V/60Hz...Optional splitter, single head teaching microscope, binocular assistant microscope, internal or external camera and interface, and digital ...