A handheld pulse oximeter is a medical instrument that is used to measure a patient's blood oxygen level. This device is small, portable and utilized to pinpoint heart and respiratory conditions that can cause breathing problems. The blood's oxygen levels usually decreases when a patient develops breathing difficulties.Arterial blood gases and handled pulse oximeters are the two methods used for measuring blood oxygen levels. Even though many hospitals have large pulse oximeters, the handheld varieties are better suited for most medical settings because they are able to be easily transported. Portable oximeters are not difficult to use and are ideal for patients who need to monitor their own oxygen levels at home.Depending on the particular manufacturer, handheld pulse oximeters work sligh