Usmile atme's List: Objective 019: Perform Pulse Oximetry

Sooby says: a site designed for health care assistants. Simple, basic and easy to read

Sooby Says: a good link provising hints and tips and explanations on how to use pulse oximetry and its limitations.

Sooby Says: all you would ever need to know about pulse oximetry. i think that this is overdetailed but it is easy to read and well subtitled.