A Fingertip Pulse Oximeter is a compact, portable device that measures the quantity of oxygen transported throughout the body. This painless device connects to the fingertip and sends two wavelengths of light through it to monitor the pulse rate and oxygen levels in the system. The screen of the Fingertip Pulse Oximeter can reveal the percent of oxygen in the bloodstream that comes from the heart, as well as the current pulse rate, once it has completed its examination.