AmScope SM790B 7X-90X Binocular Zoom Power Stereo Microscope Head

7X-90X super widefield continuous zoom magnification power Crystal clear stereo erect images over a super wide field view Super widefield high-eyepoint 10X eyepieces with FOLDABLE eye-guards 48mm (in diameter) female thread for adding Barlow lenses or lights Mounting Size: 3" (76mm) in diameter