A **Pulse Oximeter** is a small, non-invasive medical device that rapidly and painlessly measures two critical physiological parameters: **oxygen saturation levels (SpO2)** in the blood and the **pulse rate (heart rate)**. Typically clipped onto a fingertip, toe, or earlobe, it uses light absorption principles to estimate the percentage of hemoglobin in the blood that is saturated with oxygen. This device is an invaluable tool for monitoring respiratory function and overall health, particularly for individuals with conditions like asthma, COPD, pneumonia, or sleep apnea, as well as for athletes monitoring their exertion. A healthy SpO2 reading is typically between 95% and 100%. Deviations from this range can indicate underlying respiratory issues. The pulse oximeter provides instant feedback, empowering individuals and caregivers to track vital signs at home and identify potential concerns that may require medical attention.