Please contact us if you have any question. We will work with you to solve any problems. Thank you! Magnification Continuous Zoom 3.0X-90X Binocular Industrial Stereo Microscope+0.5X/2X Auxiliary Objective Lens+56 led Ring Light$232.99 Magnification Continuous Zoom 3.5X-90X Big Size Metal Stand Binocular stereo microscope+0.5X/2X Auxiliary Objective Lens+56 led$239.99 Magnification Continuous Zoom 7X-45X Big Size Boom Stand Binocular stereo microscope Industrial microscope+56 led Ring Light$159.99 Magnification Continuous Zoom 7X-45X Big Size Metal Stand Binocular stereo microscope Industrial microscope+56 led Ring Light$179.99 Magnification Continuous Zoom 7X-45X Big Size Boom Stand Binocular stereo microscope Industrial microscope+56 led Ring Light$199.99 Magnification Continuous Zoom 3.5X-180X Big Size Metal Stand Binocular stereo microscope+0.5X/2X Auxiliary Objective Lens+56 led$276.99 Magnification Continuous Zoom 0.35X-90X Big Size Boom Stand Binocular stereo microscope Industrial microscope+56 led Ring Light$269.99 wy-plugin-end DESCRIPTION Mini stereo plastic microscope has sharp stereo erect image over a wide field view. Widely used in electric factories, laboratories, schools, scupture and families etc. 2.TECHNOLOGY DATA Theory:Stereo Microscope Drawtube:Binocular Objective lens: 2X Eyepieces:WF10X/WF20X Total Magnification:20X/40X Total magnification 20X= (Eyepieces 10X) x(Objective lens 2X) Total magnification 40X= (Eyepieces 20X) x(Objective lens 2X) Top Light:LED Electrical Illumination Interpupillary distance: 50-75mm Batteries:2 AA Batteries (Not Included) 3. OPERATION DESCRIPTION The room temperature for the microscope is between -5℃ + 40℃. Touch switch position “ON”, the microscope light will turn on. Place the specimen in the center of the working plate and fix it with stage clips. Loosen fastening knob and move the head up a