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Nonin is what I use to spot check my patients. We use Drager and Masimo sensors at my hospital. To be honest, a PulseOx is just an infrared light that measures 02 content in the blood. You can buy cheap $20 PulseOx's at Walgreens, they work fine and last a long time. The "bells and whistles" would be a unit that can detect CO (carbon monoxide), has blue tooth or wifi to trend data, and is small and portable.
I think having an SpO2 monitor on a wearable device is awesome. It will benefit many COPD and chronic lung patients.
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