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95 and 100 percent. Also, if this level falls below 90%, you should get medical assistance as soon as possible. How pulse oximeters work Actually, these devices can be attached to a foot, wrist, finger or other devices to measure oxygen saturation. Oxygen saturation may fall below the minimum level due to many reasons, such as drowning, suffocation, infection and suffocation, just to name a few. These devices shine a light through a transparent area of your skin and then the light shines

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