4 ms·
Pulse oximeters work by looking at the fingernails, and they're the usual way to measure a pulse. There's a lot of blood flow in the face - try bumping into so
by thisrod 14y ago
Pulse oximeters work by looking at the fingernails, and they're the usual way to measure a pulse. There's a lot of blood flow in the face - try bumping into something sharp - so this isn't too surprising.
- pygy_ 14y agoA Pulse oximeter doesn't measure the spontaneous signal. There's a red/infrared led on one side of the finger, a detector on the other side, and it measures the amount of light absorbed by the blood.