Pulse Oximeter

My brother has been having breathing problems so they set him up with a medical station at home. He has to check his blood pressure, weight and also his oxygen level. They gave him a pulse oximeter so that he could report his oxygen level every day. There are several kinds. His is the type you put on the end of your finger. But they make them for your wrist, as well. There are several other kinds such as tabletop and hand held oximeters. They are used everywhere in the medical profession, hospitals, clinics, etc.