Best devices for meditators in the year 2024 to measure heart rate & respiration rate

Single channel ECG device to write Nature papers with it: Device to measure respiration rate to write Nature papers with it: But unfortunately, these devices have first to be made more user friendly by people such as Giacomo Indiveri: Director of the Institute of Neuroinformatics, University of Zurich and ETH Zurich: And funded by Vanja …