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A finger pulse oximeter consists of a clothes pin (or clothes peg) like arrangement of a plastic probe, which fits over the finger nail (Picture 1). One of the prongs contains two diodes, one emitting infra-red light and the other emitting red light. When this light passes through the finger tip there it is partially absorbed by the blood passing through the finger tip. The difference between the amount of red and infra-red light absorbed is related to the content of oxygen in the blood.