Item Type: Zoom Trinocular Microscope Head_x000D_Material: Metal, glass_x000D_Application: Microscopic experiment_x000D_Head: 45 degree tilt 360 degree rotation trinocular to simulate focus length_x000D_Eyepiece: 30mm ultra wide field of view high magnification lens WF10X/20_x000D_Zoom Range: 6.5:1_x000D_Trinocular Port: 23mm / 0.9in optical port_x000D_Interpupillary Distance: 2-1/8in to 3in (54-76mm)_x000D_Field of View: 1-1/4in (33mm)_x000D_Working distance:_x000D_Use 0.5X Objective Lens: 3.5X-45X(165mm)_x000D_Use 2.0X Objective Lens: 7X-90X (40mm)_x000D_Head Installation Diameter: 3in (76mm)_x000D_Accessories Installation Diameter: 1-7/8in (48mm internal thread) 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.1 x Microscope Head 2 x Eyepiece 1 x 0.5X Object Lens 1 x 2X Object Lens 2 x Rubber Eye Patch 1 x Hex Wrench 1 x Dustproof Bag This product is an optical instrument, please do not place the product in an environment that is too corrosive, humid and high temperature