An Otoscope is an instrument with lighting and magnifying systems used for visual examination of the tympanic membrane and the canal connecting it to the exterior of the body.
Otolaryngology, also called otorhinolaryngology, medical speciality concerned with the diagnosis and treatment of diseases of the ear, nose, and throat.
A phonograph, also called record player, an instrument for reproducing sounds by means of the vibration of a stylus, or needle, following a groove on a rotating disc.
The lie detector, also called polygraph, an instrument for recording physiological phenomena such as blood pressure, pulse rate, and respiration of a human subject as he answers questions put to him by an operator.
Optometer is an instrument for measuring the refractive error of an eye.