Microscope Specifications Observation head Trinocular observation head inclined at 45¡, rotateable through 360¡, interpupilary distance adjustment ring 55-75mm, dioptric adjustment ring on the left ocular having adjustable dioptric scale with trinocular tube for photomicrographic/camera attachments. Anti-Fungal Treated Observation Head. Main body All parts die casted to provide long life & good mechanical strength.