SpO2 Is a measurement of the amount of oxygen attached to the haemoglobin cell in the circulatory system.  Put simpler it is the amount of oxygen being carried by the red blood cell in the blood.  SpO2 Is given in as a percentage, normal is around 96%.  The "S" stands for saturation.

Very simply:  SpO2 Goes up and down according to how well a person is respiring (breathing) and how well the blood is being pumped around the body, however, like most things in physiology it is more complicated than this.  

All in one a small handheld unit which delivers all three essential validation checks required to assure proper oxygen concentration.

With microprocessor logic and ultrasound technology, there is no need to carry a toolbox full of test equipment to measure concentrator performance. One simple tubing connection and you're ready to go. It comes complete with carrying case and a 9 volt battery installed.