The proximal part contains a zoom eyepiece, a handle for managing the distal end, buttons for controlling the supply of water and air, means of withdrawing secretions, and a hole for passing biopsy probes. Secretions are withdrawn automatically when an aspirator is connected. Distance marks are made at intervals of 50 mm on the working part. A xenon flash lamp is used in photography. The shutter is synchronized with the flash tube. The camera is coupled to the eyepiece by a bayonet fitting. The sensitivity of the photographic film is 45 units GOST.