Viewing head: 45' or 60' inclined, 360' rotatable binocular head or trinocular 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 0.67X-4.5X. Magnification range: between 5X-160X. 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.