smartphone vs. pulse oximeters (IMAGE) University of Washington Caption One way to measure oxygen saturation is to use pulse oximeters — those little clips you put over your fingertip (some shown here in gray and blue). In a proof-of-principle study, University of Washington and University of California San Diego researchers have shown that smartphones are capable of detecting blood oxygen saturation levels in a comparable range to the standalone clips. The technique involves having participants place their finger over the camera and flash of a smartphone. Credit Dennis Wise/University of Washington Usage Restrictions For reuse with appropriate credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.