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 photomicrographiccamera attachments. Anti-Fungal Treated Observation Head. Main body All parts die casted to provide long life & good mechanical strength.