Standard Reference ECG Devices to Validate Heart Rate Monitors and for Respiratory Rate Estimation?

We did not go yet through all the paper of the Respiratory Rate Estimation Project: http://peterhcharlton.github.io/RRest/ But there are different data sets available for the validation of respiratory rate estimation data. These where optained from a big number of subjects. We could not find a list of supported devices for respiratory rate estimation. A recent …