This is a trinocular 3.5X-90X zoom stereo microscope on a versatile double-arm boom stand with a 4-zone LED illumination, giving crystal clear sharp images and bright cool lighting illumination. It comes with a trinocular head with 30mm super widefield high-eyepoint eyepieces, a heavy-duty double-arm boom stand, and a 144-LED ring light with control box and dimmer. The microscope offers high resolution, super widefield of view, large magnifying zoom range (26:1) and long working distance (8", 200mm). Its trinocular port enables to add photographic or video capability. The versatile double-arm boom stand allows you to turn the microscope head around three different axis (x, y, and z). You can point the microscope head in ANY direction desired. The 144-LED ring light is lighting-direction changeable and lighting-intensity adjustable, providing cool, even and bright LED illumination. It features a separate control box allowing you to turn on/off each portion of the 4 light zones individually as well as changing the lighting direction so you may obtain the best images for your stereo microscope. This microscope is an ideal instrument for gemologists, engravers, collectors, manufacturing engineers and anyone in semiconductor and/or electronic industry. It is also a right microscope for biological laboratory applications that require low heat release. Features: 3.5X-90X Continuous Zoom Magnification Power with a 4-zone 144-LED Ring LightIntensity-adjustable Bright LED Cool illuminationTrinocular Design for High Quality Photo, USB PC and CCD Video ImagingUpright Tube for USB Digital Camera, Video Camcorder or CCD CameraHigh Resolution with Great Flatness and ContrastErect Stereo Sharp Images Over a SUPER Widefield of ViewAccurate Alignment Ensuring Fatigue-Free Long Time ViewingCrystal Clear Original True Color Images45-Degree Inclined Trinocular Head with SUPER Widefield High-Eyepoint Eyepieces30mm WF10X/20 SUPER Widefield EyepiecesBoth Ocular-Tubes with Adjustable DiopterAdjustable Interpupillary DistanceFull Optical Glass ElementsPrecise Ground Glass Lenses8" (200mm) Large Working DistanceVersatile Boom Stand Covering Large Working AreaDouble-Arm Design for 3-Degree FreedomAble to Place Microscope Head Toward to Any DirectionHeavy-Duty Cast Steel Stand Finished with Stain Resistant EnamelRugged Solid Cast Steel BaseAll Metal Mechanical ComponentsRubber Eye-guards IncludedManufactured under ISO 9001 Quality Control StandardExcellent Five (5) Year Manufacturer WarrantySpecifications: Head: 45-degree inclined 360-degree swiveling trinocularEyepiece: 30mm super widefield high-eyepoint WF10X/20Barlow Lens: 0.5X & 2.0XObjective: 0.35-9.0XZoom Range: 26:1Diopter Adjustment: +/- 5dpInterpupillary Distance: 2-3/16" - 2-15/16"(55-75mm)Working Distance: 8" (200mm)Illumination: 144 white LEDsPower input: 110-240V, 50-60Hz, Automatic SwitchingBoom Stand: 20" double-arm (overall length: 30"), 17" high pillar, 10-1/4"x8-1/4"x2" solid cast steel baseAccessories: eye-guards.