✔pulse oximeter is a small, non-invasive medical device that measures the level of oxygen in your blood. key features; 1.Monitoring chronic conditions: People with chronic lung diseases like COPD or asthma may use pulse oximeters to monitor their oxygen levels at home. 2.Sleep apnea screening: Pulse oximetry can help diagnose sleep apnea by monitoring oxygen levels during sleep. Post-operative monitoring: Patients recovering from surgery may have their oxygen levels monitored with a pulse oximeter. 3.Exercise monitoring: Athletes can use pulse oximeters to track their oxygen levels during exercise.