A sphygmomanometer (/ˌsfɪɡmməˈnɒmɪtər/ SFIG-moh-mə-NO-mi-tər), a.k.a. a blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure, composed of an inflatable cuff to collapse and then release the artery under the cuff in a controlled manner,[1] and a mercury or aneroid manometer to measure the pressure. Manual sphygmomanometers are used with a stethoscope when using the auscultatory technique.

BP 138/73 mmHg as result on electronic sphygmomanometer
Aneroid sphygmomanometer with an adult cuff
Aneroid sphygmomanometer dial, bulb, and air valve
Clinical mercury manometer
Clinical WelchAllyn sphygmomanometer

A sphygmomanometer consists of an inflatable cuff, a measuring unit (the mercury manometer, or aneroid gauge), and a mechanism for inflation which may be a manually operated bulb and valve or a pump operated electrically.

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