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Oximeters are widely used in hospitals, medical clinics, operating rooms, and homes and can be used any time, at home, at work, or during exercise or recreation. This chapter discusses the purpose, principle of operation, specifications, and applications of pulse oximeter. Oximeters can give an accurate reading within seconds and therefore are especially useful in an emergency situation. Pulse oximeters also measure and display pulse rate as both oxygen saturation level and pulse rate are considered vital signs of a patient. The working of the pulse oximetry is based on a noninvasive spectrophotometry technique. The measurement for haemoglobin O 2 saturation is based on the absorption of different wave lengths of light from oxygenated and deoxygenated haemoglobin. Pulse oximeters make use of two light‐emitting diodes, one in the red region (660 nm) and the other in the infrared region (940 nm). Handheld or tabletop oximeters can work with ear clip sensors.

For jewelry expert Amanda Triossi, the hot collectibles are chunky sixties baubles. Marion Hume takes a closer look and finds they are, indeed, diamonds in the rough

At 81, the writer Betty Fussell has cooked up a singular American life. Sally Singer shares five meals with a national treasure.

To guide them through a volatile election season, Americans are turning to Washington Week's Gwen Ifill as a sane voice amid the hoopla.

A young American transforms his souvenirs of a happy childhood into a playful line of fine jewelry.

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