The Aven Binocular Stereo Zoom Microscope is a high-quality microscope designed for professional use. It features a binocular body that can be rotated 360 degrees and has a 45-degree inclined eyepiece tube for comfortable viewing.Specifications Body Type - Binocular 360° rotatable 45° inclined eyepiece tube. Eyepieces - Two 10x(FN23) eyepieces supplied with microscope body. Optional 15x(FN15) and 20x(FN11.4) available to extend magnification range. Auxiliary lens - 0.5x 0.75x and 1.6x auxiliary lenses available to extend the magnification range of the microscope. Working Distance - 90 mm. without auxiliary lens 150 mm. with 0.5x auxiliary lens 105 mm. with 0.75x auxiliary lens 45 mm. with 1.6x auxiliary lens. Zoom Ratio - 4.4:1. Diopter Adjustment - On both eye tubes: +5.6D-0.72D. Interpupillary Distance - Adjustable from 52 to 75 mm. Optical System - Greenough. Item Weight - 3.65 lbs. - SKU: AVEN674