XSP-640X Series biological microscope Specification: Model xsp-640x Magnification 640x Eyepiece h10x, h16x Achromatic objectives 4x, 10x, 40xs Mechanical tube length 160mm Mechanical stages size 110mm * 120mm plain stage Coarse focus range 40mm Fine focus range 1.2mm Illumination +50mm plano and concave mirror Condenser no abbe n.A.1.25 with iris diaphragm and filter Movable specimen holder no black holder(60mm*30mm) Accessories multifarious eyepiece, attachable illuminator