VanGuard 1122SP Stereo Microscope with Binocular Head and Pole Stand, 10X Eyepiece, 1X and 2X Objective, 10X and 20X Magnification Intermediate-level stereo microscope creates three-dimensional images for basic research and educational applications Binocular head with 360-degree rotation and fixed 45-degree vertical inclination to ease eye strain, -5 to +5 dioptric adjustment capabilities to compensate for the difference in viewing ability between each eye, and 51 to 77mm interpupiliary distance adjustment for individual eye spacing 20 mm 10x widefield eyepiece (DIN); stereo objectives (1x and 2x, 1x and 3x, 2x and 4x, or 1x and 4x); parfocal and parcentered with revolving turret objectives so that items stay in focus when objectives are rotated; working distance of 102mm Black/white reversible stage plate to view light or dark samples, and locked-on, spring-loaded, stainless steel stage clips for durability Knurled focus adjustment knobs, for controlled focusing, rack and pinion assembly, slip clutch mechanism, and tension control mechanism to protect the gears