A Pulse Oximeter is a portable device used to measure the levels of oxygen in a person’s blood and their heart rate, providing crucial information in emergencies. It works by clipping onto a fingertip, earlobe, or toe and using light sensors to detect the amount of oxygen in the blood and the heartbeat. The device displays two key readings on a small screen: oxygen saturation (SpO2), which indicates the percentage of oxygen in the blood, and heart rate (bpm), showing the number of heartbeats per minute. Non-invasive and easy to use, the pulse oximeter is compact and lightweight, making it ideal for quick assessments in various settings. It helps medical professionals quickly determine if a patient is receiving adequate oxygen and monitor their heart rate, which is essential for effective emergency care and treatment.