This is a super widefield trinocular stereo microscope head with 20X 30X 40X and 60X magnification settings. It includes a 1.5X Barlow lens and a pair of super widefield high-eyepoint WH10X/20 eyepieces coming with 45° inclined 30mm eyetubes with diopter. The super widefield optics and high-eyepoint design ensure an easy and comfortable observation. Its trinocular port allows you to add photo or video capability. The microscope provides high resolution clear images super widefield of view and large working distance. It fits all the focusing racks with a 3 (76mm in diameter) O-ring holder. Features: 20X 30X 40X and 60X Magnification Settings 45° Inclined Trinocular Head with 30mm Super Widefield WH10X/20 Eyepieces High Resolution with Great Flatness and Contrast Sharp Stereo Erect Images over a Wide Field View High Quality Clear Original True Color Images Ocular-Tube with Adjustable Diopter Large Working Distance Accurate Alignment Ensuring a Fatigue-Free Viewing Full Optical Glass Elements Precise Ground Glass Lens All Metal Mechanical Components Adjustable Interpupillary Distance Foldable Rubber Eyeguards Included Manufactured under ISO 9001 Quality Control Standard Excellent Five (5) Year Manufacturer Warranty Specifications: Head: 45° inclined 360° swiveling trinocular Eyepiece: WH10X/20 super widefield 30mm high-eyepoint Barlow Lens: 1.5X Objective: 2X and 4X Diopter Adjustment: ?5dp Interpupillary Distance: 1-7/8 - 2-15/16 (47-75mm) Field of View: 0.394 (10mm) @ 20X Working Distance: 4 (100mm) Head Mounting Size: 3 (76mm) in diameter Accessory Mounting Size: 1-7/8 (48mm female thread) in diameter Packing List: One 20X and 40X Trinocular Stereo Zoom Head One Pair of Super Widefield WH10X/20 Eyepieces One 1.5X Super Widefield Barlow Lens One Pair of Foldable Eye-Guards User s Manual Shipping Weight: 10 lbs