Good to know - This Braun oximeter measures your oxygen saturation levels, pulse amplitude and pulse rate to give you a clearer picture of your health - Its backlit OLED display has 4 orientations so you can see your data at the touch of a button - You can also get an ECG graph to monitor your heart rate right at home - It's super easy to use - just clip it on your finger and get accurate results fast - no needle prick required