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crwdns2933797:0Sam Goldheartcrwdnd2933797:0crwdne2933797:0

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-[* black] sensor disassembly? - no way
-[* black] And now, what you’ve been all waiting for: in-action shot of pulse oxymeter ([https://m.media-amazon.com/images/M/MV5BMjA0MDI1MTQ1Ml5BMl5BanBnXkFtZTcwMTQxMDQyMQ@@._V1_.jpg|light show|new_window=true])
- [* icon_note] By bouncing a Christmas-y array of red, green, and infrared lights onto your skin, then watching how they bounce back with photodiodes, the sensor can tell how oxygenated your blood is.
- [* black] Blood that's oxygenated is bright red inside your body, dark red when it lacks for oxygen, and each reflects light differently.
- [* black] Having low blood oxygen, or hypoxemia, can indicate COVID-19 or other medial issues, as your lungs may not be absorbing enough oxygen, or your organs need more than normal to function.
- [* black] You can read a bit more about [https://www.cnet.com/health/apple-watch-blood-oxygen-app-how-it-works-and-how-to-use-it/|how blood oxygen tracking works at CNET], or a ''lot more'' at the [https://www.sciencedirect.com/science/article/pii/S095461111300053X|Respiratory Medicine journal].
+[* black] Fused display on top, fused sensor array on the bottom. We're not gonna find anything but broken pieces if we bust this apart, so let's teardown ''with our eyes.''
+[* black] Here's the pulse oximeter ~~[https://m.media-amazon.com/images/M/MV5BMjA0MDI1MTQ1Ml5BMl5BanBnXkFtZTcwMTQxMDQyMQ@@._V1_.jpg|communicating with aliens|new_window=true]~~ in Christmas-y action!
+[* icon_note] By shining red, green, and infrared lights on your skin, then watching via photodiode how they bounce back, the sensor can tell how oxygenated your blood is ([https://en.wikipedia.org/wiki/Blood#Color|redder means more oxygen|new_window=true]).
+ [* black] Low levels of oxygen in the blood ([https://www.mayoclinic.org/symptoms/hypoxemia/basics/causes/sym-20050930|hypoxemia|new_window=true]) can be an indication of COVID-19 or other serious medical issues.
+ [* black] The Apple Watch doesn't track body temp like the [https://www.youtube.com/watch?v=BwA1hmSVgVY|Oura Ring 2] does. But while nice to know, neither are likely to be [https://www.wired.co.uk/article/blood-oxygen-spo2-covid-wearables|accurate enough|new_window=true] for certainty.
+ [* black] As a reminder we're not health experts, so read up! Find out more about [https://www.cnet.com/health/apple-watch-blood-oxygen-app-how-it-works-and-how-to-use-it/|how blood oxygen tracking works at CNET], or a ''lot more'' at the [https://www.sciencedirect.com/science/article/pii/S095461111300053X|Respiratory Medicine journal].