YBB XSP-104M Professional Binocular Biological Compound Microscope, 40X-2500X Magnification, Double-Layer Mechanical Stage, LED Illumination and Coaxial Coarse Coaxial coarse and fine adjustment, focusing range 20 mm Achromatic objectives:4x, 10x, 40x , and 100x .magnification:40X-2500X N.A=1.25 abbe condenser with iris diaphragm for clear examination and light control Dual observation head:30 degree inclined and tube vertical, 360 degree rotatable Package:a microscope,manual;WF10X(2),WF16X(2),WF25X(2)