Features: 7X to 45X Continuous Zoom Magnification Power 45-degree Inclined Trinocular Simul-focal Head with SUPER WIDEFIELD High-Eyepoint Eyepieces Trinocular port for adding photo or video capability 30mm Super Widefield WF10X Eyepieces with 20mm Field of View High Resolution with Great Flatness and Contrast Sharp Stereo Erect Images over a Wide Field View Crystal Clear Original True Color Images 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 Manufactured under ISO 9001 Quality Control Standard Specifications: Head: 45-degree inclined 360-degree swiveling trinocular simul-focal Eyepiece: 30mm super widefield high-eyepoint WF10X/20 Objective: 0.7-4.5X Zoom Range: 6.5:1 Trinocular Port: 23mm photo port Interpupillary Distance: 2-1/8" to 3"(54-76mm) Field of View: 1-1/4" (33mm) Working Distance: 7X-45X (100mm) Use 0.5x objective lens 3.5X-45X(165mm) Use 2.0x objective lens 7X-90X(40mm) Head Mounting Size: 3" (76mm) diameter Accessory Mounting Size: 1-7/8" (48mm female thread) diameter 144 bright white LED bulbs 100,000 hours of life Intense and focused shadow-free illumination The brightness of 0-100%Adjustable,high brightness Variable intensity control Power input: 100-240V, 50-60HZ Suit for the dia of the lens: 30mm-160mm Package Including: 1 x Trinocular Stereo Zoom Head(Working distance is about 10cm) 1 x Pair of Super Widefield 10X20MM Eyepieces 1 x Pair of Eye-Guards 1 x Dust Cover 1 x 144-LED Ring Light 1 x Big Stand 1 x 76mm Focusing Holder 1 x High temperature resistant working pad 1 x 1.0X Microscope Auxiliary Objective Lens(Protective Function Lens) （Optional） 1 x 2.0X Microscope Auxiliary Objective Lens(Working Distance 40 mm) 1 x 0.5X Microscope Auxiliary Objective Lens(Working Distance 165 mm) 1 x Adjustable Metal Arm