Pulse oximeters are non-invasive medical devices designed to measure the oxygen saturation level (SpO2) in the blood, along with the heart rate. These compact, portable devices are commonly used in hospitals, clinics, and homes to monitor respiratory health, particularly in conditions like COPD, asthma, and during recovery from illness or surgery. By clipping onto a fingertip, the device uses light to assess oxygen levels, providing quick and reliable readings. Pulse oximeters are essential tools for individuals managing chronic respiratory issues, athletes tracking performance, or anyone needing real-time monitoring of oxygen levels.