... inverted metallurgical microscope ,imaging clearly, wide field of vision J-300,The whole design accord with man-computer ... 7)Focus system:Coaxial coarse /fine focus system,with tensional adjustable by hands ,coarse focus:26mm, ... with iris diaphragm,condenser center adjustable9)Illumination:Halogen Lamp,6V/20W,brightness adjustable10)Power:transformer,220V J-300 Inverted metallurgical microscope ...