... : Achromatic DIN 4X,10X,40X(S),100X T-25 Microscope observation instumentUsesMonocular oblique cylinder compact series biomicroscopy ... : Double Layers Mechanical Stage140X140mm/75X75mm5Condenser: Abbe NA1.25 with lris Diaphragm& Filter6Illumination: Built-in Illumination, ... Condenser:ABBE condenser N.A=1.25 with iris diaphragm,Kolher illumination is optional. T-25 Microscope observation instument