Features: High quality optical system, wider range of magnification. Each mirror is coated with a special film of optical components, imaging clear and bright. With the use of eyepiece and auxiliary objective lens, the magnification can be extended to 3.5x-90x. Super long effective working distance, standard working distance 100mm. The observation head can be tilted at 45 degrees and rotated 360 degrees, which is suitable for eye spot brightness and will not fatigue for a long time. Tri-vision adjustable, ensure different vision can get clear and satisfactory image. Variable double handwheel horizontal (axial) bilateral setting operation is convenient and comfortable, variable double repeat precision is high. Applicable to electronics industry, hardware processing, jewelry archaeology, textile printing, engineering plastics, biological dissection teaching and so on. Specification: Material: Aluminum alloy Weight: 6300g/222.2oz Magnification target: 0.7X-4.5X Observation: binocular tilt angle 45 ° Pupil distance adjustment range: 54mm - 76mm Adjustable bilateral visibility: ± 5 diopter Stage into a circular plate: 95mm black and white plate Working distance: 100mm Eyepiece interface: Trinocular interface 1X, 0.5X ; Dedicated interface 1XCTV Focus bracket focus handwheel sealing adjustable: 50mm (lifting range) Size: as pictures shown Package List: 1 x Trinocular Stereo Microscope (Bracket included) 2 x 10X Eyepieces 1 x 0.5X Eyepieces 2 x Silicone Eye Mask 1 x Dust Cover 3 x Dust Cap 1 x Screwdriver Tool 1 x Desiccant 1 x Hex Screwdriver 1 x LED Ring Light Lamp 1 x Power Adapter 1 x Camera Adapter .