Viewing head: 45' inclined, 360' rotatable binocular head or rinocular head. The inter-pupillary distance adjustable between 54-75mm; both diopter adjustment of range +or -5mm. Eyepiece: Wide field, high-eyepoint eyepice, It can observe image of observation specimen with glasses. Objective: Zoom objective magnification 0.70X-4.5X. Magnification range: between 3.5X-180X. Working distrance: 100mm, special maximum working distance can provide more working space for you Illumination: Built-in and built-out illumination system. Accessories: There are many accessories to choose