45mm Din Achromatic Objective:4X, 10X, 40X(S),100X(S,Oil) Wide Field Plane-scope eyeplece: WF10X;WF16X; total magnification:40X-1600X Articulated Free Binocular Head, interpupillary Distance:55-75mm,30° Inclined; 360° Rotatable Double Layers Mechanical stage:140*155mm, Moving range X-Y:70X50mm 2-30mm Iris Diaphragm and 32 Filter; ABBE Condenser:N.A.1.25 Coaxial coarse and Fine Focusing Adjustable Mechanism:25mm Precision:0.002mm Built in Digital Camera System, Resolution:1280(H)*1024(V),1/2'',chip; USB2.0, with Micro-image Process Software;Nosepiece:Forward Quadreple Nosepiece. Built in Adujstable Brightness Halogen Lamp 6V/20w(or Incandescent, or fluorescent,or LED)