Several of the biggest names in wearables, including Fitbit, Oura and Whoop, have added temperature tracking to their devices.

And rumors suggest that Samsung’s next Galaxy smartwatch and the Apple Watch Series 8 might be next. But what are the benefits?

Wearable thermometers — also known as continuous thermometers — have been around for years in hospitals and medical settings.

“Temperature tracking wearable devices can continuously and seamlessly collect data and record temperature trends,” Professor Hossam Haick, an expert in nanotechnology and non-invasive disease diagnosis, tells us.

“They automatically provide notifications when physician-specified high-temperature thresholds are exceeded.”

But outside of medical care, what’s the point of tracking your temperature 24/7? Why would we want a temperature sensor on our Apple Watch? We found out.