Feature: 1. [3.5X to 90X] Continuous zoom ratio from 3.5X to 90X, 30mm ultra wide field of view WF10X eyepiece, so you can use it with confidence. 2. [Wide Viewing Distance] Trinocular stereo microscope head tilted at 45 degrees, with super wide viewing distance high eye position eyepiece. 3. [High Resolution] Trinocular microscope head with high resolution, good flatness and contrast, pointed stereo upright images over a wide field of view, clear original true color images. 4. [Accurate Alignment] This microscope head with large working distance, accurate alignment, ensuring fatigue free viewing, to meet your various need. 5. [Adjustable Interpupillary Distance] Trinocular interface can add photo or video function. Adopt optical glass elements, metal mechanical parts, and the interpupillary distance is adjustable. Specification: Item Type: Zoom Trinocular Microscope Head Material: Metal, glass Application: Microscopic experiment Head: 45 degree tilt 360 degree rotation trinocular to simulate focus length Eyepiece: 30mm ultra wide field of view high magnification lens WF10X/20 Zoom Range: 6.5:1 Trinocular Port: 23mm / 0.9in optical port Interpupillary Distance: 2-1/8in to 3in (54-76mm) Field of View: 1-1/4in (33mm) Working distance: Use 0.5X Objective Lens: 3.5X-45X(165mm) Use 2.0X Objective Lens: 7X-90X (40mm) Head Installation Diameter: 3in (76mm)Accessories Installation Diameter: 1-7/8in (48mm internal thread). Package List: 1 x Microscope Head2 x Eyepiece 1 x 0.5X Object Lens1 x 2X Object Lens 2 x Rubber Eye Patch1 x Hex Wrench1 x Dustproof Bag Note: This product is an optical instrument, please do not place the product in an environment that is too corrosive, humid and high temperature