Hi,

To measure blood pressure, doctor uses an instrument called a sphygmomanometer , which is more often referred to as a blood pressure cuff. The cuff is wrapped around your upper arm and inflated to stop the flow of blood in your artery.

A sphygmomanometer also known as a blood pressure metre, blood pressure gauge, or blood pressure monitor, is a device that monitors blood pressure.

• The sphygmomanometer instrument consists of an inflatable rubber cuff which is applied to the arm.
• This is connected to the mercury column which helps to determine the systolic and diastolic blood pressure.
• It is composes of an inflatable rubber cuff, which is wrapped around the arm.
• A measuring device indicates the cuff’s pressure.
• A bulb inflates the cuff and a valve releases pressure.
• A stethoscope is used to listen to arterial blood flow sounds.

Hope this helps.