Which instrument is designed to measure lung capacities?

The spirometer is the instrument specifically designed to measure lung capacities. It quantifies the volume of air inhaled and exhaled, providing critical information about lung function. Spirometry tests are essential for diagnosing and monitoring respiratory conditions, such as asthma and chronic obstructive pulmonary disease (COPD). The readings obtained from a spirometer help assess the efficiency of the lungs and can guide treatment decisions.

In contrast, the other instruments serve different purposes. A thermometer measures body temperature; a sphygmomanometer is used to measure blood pressure; and an oximeter measures the oxygen saturation level in the blood. None of these tools provide information about lung capacities.