In the Covid-19 era, having a pulse oximeter is almost as important as having a thermometer at home. Here’s why and how you can use it.

As the name suggests, the Pixel Watch 3 can detect the absence of a pulse while it's being worn on your wrist. It does this using the same optical sensors that are used to measure your heart rate.

Blood, or pulse, oximeters have been used as one tool for determining whether a person may have coronavirus or a condition called "silent hypoxia." ...

Explore the Apple Watch's blood oxygen sensor, learn how to use it, and understand its health insights.

Wondering if the Apple Watch really nails your heart rate readings? Its sensor is surprisingly reliable, though not quite doctor-level precise.

Parts designed and marketed for a specific application can nevertheless still be useful in other ways, and whenever that happens, it’s probably the start of a pretty good hack. Using a sensor… ...