Indication: Chronic obstructive pulmonary disease (COPD) Asthma Pneumonia Lung cancer Anemia Heart attack or heart failure Congenital heart defects   How it works: During a pulse oximetry reading, a small clamp-like device is placed on a finger. Small beams of light pass through the blood in the finger, measuring the amount of oxygen. It does this by measuring changes of light absorption in oxygenated or deoxygenated blood. This is a painless process. The pulse oximeter will thus be able to tell you your oxygen saturation levels along with your heart rate.   How to use: To use a pulse oximeter, you’ll clip the device on your finger. here’s to use it properly so you can get an accurate reading.   Active Ingredients: Infra-Red Technology Function: A small device that typically clips on to your finger to measure oxygen levels in the blood. Pulse oximetry is a quick and easy way to determine how well oxygen is being sent from the heart and lungs out to the furthest parts of the body, which can help determine if your heart and lungs are functioning properly.