Provide high definition image of observation specimen. Upright binocular head. Diopter adjustment of range +or-5mm. The inter-pupillary distance adjustable between 55-75mm. Slide-in objective. Built-in illumination system as 230V/10W(12V/10W tungsten bulb) (CE and GS approved) or 115V/10W(12V/10W tungsten bulb.) If you equipped gem clamp and dark filed with 2L type stand, then it can be used as a jewelry microscope