Printable checklist

🔆 What the Finger Clip Measures

Light-based oxygen monitoring — and why it beeps falsely.

How the pulse oximeter works

  • The small device on your finger is called a **pulse oximeter**.
  • It shines two beams of light through your skin to measure the color of your blood.
  • Red blood cells carrying oxygen absorb light differently than cells without oxygen.
  • The sensor calculates your **oxygen saturation**, which is the percentage of oxygen in your bloodstream.
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Why Hospitals Do That logoWhy Hospitals Do That

Explaining the systems behind hospitals. Educational content only — not medical advice. Always consult a healthcare professional for medical decisions.