This trinocular 3.5X-90X zoom stereo microscope is on boom stand with 80-LED ring light. It comes with a 45 degree inclined trinocular head super widefield optics a heavy-duty single-arm boom stand and a 80-LED ring light. The 45 degree inclined eye tube and high-eyepoint optical design ensures easy and comfortable observation. The rubber eye-guards provide further comfort. The microscope offers high resolution 2-1/2 (65mm) super widefield of view 26:1 large magnification zoom range and 8 (200mm) long working distance providing crystal clear sharp images. The 80-LED ring light provides bright cool and even illumination. Its trinocular port allows to add photo / video capability to the microscope. It is an ideal instrument for researchers gemologists engravers collectors and anyone in semiconductor and electronics industries. It is also a perfect microscope for biological laboratory applications that require low heat release. Features : 3.5X-90X Trinocular Zoom Stereo Microscope with SUPER Widefield Optical System 80 LED White Bulb Ring Light 45 Degree Inclined Trinocular Head with SUPER Widefield High-eyepoint Eyepieces SUPER Widefield 30mm WF10X Eyepieces with 20 mm Field of View Boom Stand for Versatility Covering Large Working Area High-eyepoint Optic Design Ensuring an Easy and Comfortable Observation Rubber Eye-guards Providing Further Comfort High Resolution with Great Flatness and Contrast Sharp Stereo Erect Images over a Wide Field View Crystal Clear Original True Color Images Both Ocular-Tubes with Adjustable Diopter 8 (200mm) Large Working Distance Heavy Duty Cast Metal Boom Stand Finished with Stain Resistant Enamel Rugged Solid Cast Metal Base Accurate Alignment Ensuring a Fatigue-Free Long Hour Viewing Full Optical Glass Elements Precise Ground Glass Lenses All Metal Mechanical Components Adjustable Interpupillary Distance Rubber Eye-guards Included Manufactured under ISO 9001 Quality Control Standard Excellent Five (5) Year Manufacturer Warranty Specifications: Head: 45 degree inclined 360 degree swiveling trinocular Eyepiece: 30mm super widefield high-eyepoint WF10X/20 Barlow Lens: 0.5X and 2.0X Objective Zoom Range: 0.35-9.0X Zoom Ratio: 26:1 Working Distance: 8 (200mm) Field of View: 2-1/2 (65mm) Diopter Adjustment: +/-5dp Interpupillary Distance: 2-3/16 - 2-15/16 (55-75mm) Heavy Duty Cast Metal Boom Stand Finished with Stain Resistant Enamel Accessories: eye-guards Shipping Weight: 65 lbs Packages: 2 Packing List : One Trinocular Stereo Zoom Head One Pair of SUPER Widefield 10X Eyepieces One SUPER Widefield 0.5X Barlow Lens One SUPER Widefield 2.0X Barlow Lens One Single-Arm Boom Stand with Focusing Rack One Pair of Eye-Guards One 80-LED Ring Light with Mounting Ring Adapter User s Manual