VanGuard 1272ZL Stereo Zoom Microscope with Trinocular Head and LED Illumination, 10X Eyepiece, 110V, 7X - 45X Magnification Stereo zoom microscope creates three-dimensional images for inspection and dissection Choice of binocular or trinocular viewing 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 55 to 90 mm interpupiliary distance adjustment for individual eye spacing 20mm 10x super widefield eyepiece, zoom objectives 0.7x to 4.5x, zoom ratio 6.5:1, working distance of 93 mm Upper/lower bright and long-lasting LED illumination, black/white reversible stage plate to view light or dark samples, and locked-on, spring-loaded, stainless steel stage clips for durability Dual focus adjustment knobs, for controlled focusing, rack and pinion assembly, slip clutch mechanism, and tension control mechanism to protect the gears