Pulse Oximeter

[jeba]

From the article:

Called a pulse oximeter or sats probe, it measures the amount of oxygen in the blood.

This is wrong. It measures oxygen saturation, not the amount of oxygen. This isn´t irrelevant because you can have normal saturation but still not enough oxygen supply to your tissues (e. g. if your´re anemic).

[The Aquila]

It seems that if you wear apple watches, the Pulse Oximeter is likely to be built into the 6th generation