User's Manual

Radical-7 Appendix: Best Practices for Comparisons to Reference Measurements
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  Align upper and lower red lines.
  If using a reusable sensor, make sure finger tip is inserted all the way and
touching the finger stop inside the sensor (allowing long finger nails to
extend beyond the finger stop).
  Ensure cable runs flat over the top of the hand directly in the middle of
the finger with no kinks or twists so the cable does not pull on the sensor.
  Cover sensor with Masimo-provided shielding to avoid light interference.