✔Fingertip pulse oximeter under Home & Hospital Care category.
✔How to use:
✔Turn it on
✔Sit quietly for a few minutes
✔Be sure your hand is warm
✔Clip the device on the end of a finger
✔Use a finger that doesn't have nail polish or an artificial nail
✔Keep your nail facing up
✔Hold your finger still and below the level of your heart
✔You'll see results in a few seconds.