Stereo Zoom Trinocular Microscope, 21x to 135x SPZHT-135 Stereo Zoom Trinocular Microscope, 21x to 135x continuous zoom magnification with 15x eyepieces.IncludesSPZHT-135 Trinocular Body 15x Eyepieces Click stop zoom adjustment for accurate, repeatable measurements The ideal scope for a wide range of investigative/inspection applications, Aven's dynamic new microscope SPZHT-135 Trinocular microscope extends the boundaries of stereo zoom microscopy, employing standard 15X eyepieces to achieve 21x to 135x continuous zoom magnification all the while providing a continuous working distance of 3.3' (84mm). Replacing the standard 15X eyepieces with our DHW20X eyepieces enhances the magnification range of this dynamic new microscope further - 28X to 180X. Having eyepieces set at a 45 degree angle, the adjustable interpupillary distance between eyepieces of 1.96' (50mm) to 2.91' (74mm) means they can be set to the comfort level of any user. Click stop zoom adjustments assure accurate, repeatable measurements. One touch fine focus trinocular camera port adjustment for quick, easy camera focus and parfocaling the scope.Features Total Magnification of 21X to 135X at 3.3" (84mm) working distance, Max 180X with 20X eyepieces Click stop zoom adjustments for accurate, repeatable measurement Standard High Eye Point wide field 15x eyepieces at 45 degrees for comfortable viewing even for operators with eyeglasses Diopter adjustment on both eyepiece tubes Adjustable Interpupillary Distance of 1.96" (50mm) to 2.91" (74MM) accommodates any operator Multi coated optical components, free from chromatic and spherical aberration One touch fine focus adjust trinocular camera port for quick, easy camera focusing and parfocaling the scope.