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Features: 2X-90X Continuous Zoom Magnification Offering Top-Level Quality Images High Quality Extreme Widefield Focusable WH10X/22 Eyepieces 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 Large Working Distance 14\" (350mm) Accurate Alignment Ensuring a Fatigue-Free Viewing Full Optical Glass Elements Precise Ground Glass Lens All Metal Mechanical Components Adjustable Interpupillary Distance Rubber Eyeguards Included Manufactured under ISO 9001 Quality Control Standard Specifications: Head: 45-degree inclined 360-degree swiveling binocular Eyepiece: 30mm extreme widefield high-eyepoint focusable WH10X/22 Barlow Lens: 0.3X and 2.0X Objective: 0.2-9.0X Zoom Range: 45:1 Diopter Adjustment: ?5dp Interpupillary Distance: 2-3/4\" - 2-15/16\"(47-75mm) Field of View: 5-3/4\" (145mm) Working Distance: 14\" (350mm) Head Mounting Size: 3\" (76mm) in diameter Accessory Mounting Size: 1-7/8\" (48mm female thread) in diameter Packing List: One Binocular Stereo Zoom Head One Pair of Extreme Widefield WH10X/22 Eyepieces One 0.3X Extreme Widefield Barlow Lens One 2.0X Extreme Widefield Barlow Lens One Pair of Foldable Eye-Guards User's Manual Download Shipping Weight: 10 lbs","breadcrumbs":[{"label":"Home","href":"/python/html6/index.html"},{"label":"Brands","href":"/python/html6/menu_brand_index/menu_brand_index_brands_87101ba214.html"},{"label":"Amscope","href":"/python/html6/menu_brand_products/1000/11000/menu_brand_products_Amscope_1_47ff5850ea.html"},{"label":"ZM290NB","href":null}],"content":{"product":{"mpn":"ZM290NB","manufacturer":"Amscope","brand":"Amscope","brand_url":"/python/html6/menu_brand_products/1000/11000/menu_brand_products_Amscope_1_47ff5850ea.html","title":"This 2X-90X zoom magnification binocular stereo microscope head offers top-level sharp clear erect stereo images over a large zoom magnification range. 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