Which instrument is used to measure blood pressure?

The sphygmomanometer is specifically designed to measure blood pressure, making it the correct instrument for this purpose. It typically consists of an inflatable cuff that is placed around the upper arm, a measuring device (which can be analog or digital), and sometimes a stethoscope is used in conjunction to listen for the arterial sounds as the cuff deflates. This combination allows for accurate readings of both systolic and diastolic blood pressure.

Other instruments mentioned serve very different functions: a stethoscope is used to listen to internal body sounds such as heartbeats and lung sounds, a thermometer measures body temperature, and an oximeter measures oxygen saturation in the blood. Thus, while each instrument plays a crucial role in medical assessments, the sphygmomanometer is the only one among them designed specifically for measuring blood pressure.