Name a common technique used for measuring blood pressure.

The sphygmomanometer is a widely recognized device specifically designed for measuring blood pressure. This instrument typically consists of an inflatable cuff that wraps around the patient's arm and a pressure gauge to provide the measurement. When the cuff is inflated, it temporarily stops blood flow through the artery; as the cuff is gradually deflated, healthcare providers listen for the sound of blood flow to determine the systolic and diastolic blood pressures.

In contrast, a thermometer measures temperature, which is unrelated to blood pressure. An electrocardiogram records heart's electrical activity but does not measure blood pressure directly. A pulse oximeter is used to monitor oxygen saturation levels in the blood, providing another vital sign but not addressing blood pressure measurements. These functionalities highlight why the sphygmomanometer is specifically designed and used for accurately assessing blood pressure levels.