STETHOSCOPE

Stethoscope.

Standard dual ear type Stethoscope.

(Wikipedia excerpt: .."...The stethoscope [S] is a medical device for auscultation, or listening to internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the skin, with either one or two tubes connected to two earpieces. A [S] can be used to listen to the sounds made by the heart, lungs or intestines, as well as blood flow in arteries and veins. In combination with a manual sphygmomanometer, it is commonly used when measuring blood pressure.

Less commonly, "mechanic's [S] ", equipped with rod shaped chestpieces, are used to listen to internal sounds made by machines (for example, sounds and vibrations emitted by worn ball bearings), such as diagnosing a malfunctioning automobile engine by listening to the sounds of its internal parts. [S] can also be used to check scientific vacuum chambers for leaks and for various other small-scale acoustic monitoring tasks.

A [S] that intensifies auscultatory sounds is called a phonendoscope....")