The Garmin Fenix 6 can measure heart rate and respiration rate.

Resting heart rate and respiration rate are important parameters for meditators. But smartwatches are only of limited use for scientific purposes.

090. Review of Accuracy Studies of Consumer Grade Heart Rate Monitors: Methods, Testing Protocols, Reference Devices

The alternative is a device such as teh iWorx TA 220.

But who want do carry around 24 x 7 such a bulky device? Not Peter Gamma from www.petergamma.org

That is why we write about these issues here. And sooner or later we suppose that we will find what we are looking for by the BRAVE search engine in the web.

We miss such a device. That is why we promote such a device on www.petergamma.org.