Particularly useful for those with heart failure bronchial asthma and chronic obstructive pulmonary diseases this discreet device is ideal for use at home and on the move it displays easy to read measurements of arterial oxygen saturation spo2 and heart rate pulse frequency oxygen saturation indicates the percentage of haemoglobin in the blood that is located with oxygen an important parameter for assessing respiratory functionsmall ligtweight and easy to usenon invasive and complete