Specification:        Wide Field Eyepiece: 10X, 15X, 20X for choosing         Objective Lens: 2X and 4X         Total Magnification: 20X 40X, 30X 60X, 40X 80X        Working Distance of objective lens: 2X-81mm (3.19"), 4X-57mm (2.24")           Working distance means the distance between the objective lens and the object when the focus is clear         Please pay attention on this               Please kindly note: The distance between the black objective lens cover and the stage is about 53mm               If you need 81mm working distance, please take away the blackobjective lens cover            Articulated Free Binocular Head        Diopter Adjustment: +/-5dp        Interpupillary Distance: 55-75mm (2.17"-2.95"), 45 degree Inclined        Natural Light for Illuminating Gathered By Ø60mm Black and White Reversible Stage Plate        Power Supply: No        Rack and Pinion Coarse Focusing Mechanism With Slip Clutch and Tension Adjustment        Gross Weight: 1.98KG        packing: Foamed plastic + carton           Package Included：        1X Metal body stereo microscope with objective lens        2X Wide Field eyepiece (10X, 15X, 20X for choosing)        2X Rubber Eye cups        1X Dust cover