Pulse Oximeters are a non-invasive way to monitor a patients oxygen saturation. Non-invasive means that no blood sample is necessary and there is no needle. Rather, a monitor is attached that lets a doctor read blood oxygen results almost instantaneously. This saves a patient the discomfort of a needle while allowing doctors to get quicker results. As pulse oximeters can be expensive, a great way to save some money is to buy a used pulse oximeter.

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