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Illustration of a spirometer. A spirometer is a medical device used to measure lung function by recording the amount and speed of air a person can inhale and exhale. It is used to diagnose and monitor respiratory conditions such as asthma, chronic obstructive pulmonary disease and pulmonary fibrosis. The test is non-invasive and involves breathing into the device through a mouthpiece. The incentive spirometer, commonly featuring three chambers with balls that rise in response to airflow, provides visual feedback to encourage patients to breathe deeply and improve lung capacity