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A pulse oximeter works in a really brilliant manner. Instead of straightforwardly measuring the assessment of hemoglobin this little gadget takes consistent estimations of the assimilation of particular wavelengths of light in oxygenated hemoglobin. Normally the color of our blood is red because it contains oxyhemoglobin which makes it capable to soak up the light of specific wavelengths. Two types of lights are integrated by the pulse oximeter in which one is red and another is infrared. Oxyhemoglobin presented in our blood absorbs the infrared light and lessened hemoglobin absorbs the red light. The level of light absorption decides the blood oxygen level.