Warranty: 3 years Certification: CE Customized support: OEM, ODM Place of Origin: China Brand Name: OEM Model Number: A41.1903 Theory: Operating Microscope Drawtube: binocular Binocular observation: Tilting Head 0-180 Viewing Angle Adjustable for User Magnification of binocular: 8X Magnification of eyepiece: 12.5X Interpupillary distance: 50mm-80mm Diopter: ±7D Magnification changer: 3-step magnification change: 0.6X,1X,1.6X Focal length of objective: Two objectives: F=200 & F=250mm (M45x0.75mm) Total magnification: 4.8X, 8X, 12.8X, 6X, 10X, 16X Linear field: 50mm, 30mm, 19mm, 40mm, 24mm, 15mm Filter: Built-in green and yellow filters