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This non-invasive, pulse-measuring tool is something you can purchase to keep at home and use whenever you need.
If you're keen to pick one up, keep on scrolling through to see which online retailers can deliver straight to your door.
Attached to the end of a finger, pulse oximeters are small devices that use light to measure the oxygen saturation in your blood and your pulse rate.
According to the World Health Organisation, the device works by shining red light through your tissue. The amount of light that is transferred through your tissue is picked up by a sensor.
Values in the normal range are typically between 95 and 100%. According to the Mayo Clinic, readings below 90 are considered low.
If you're concerned about a low blood oxygen level reading, seek medical attention.
Main image: Getty Images
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