Rob ter Horst, Hugo Plácido da Silva & Peter Charlton: members of a marketing trust to keep prices for research & medical grade ECG devices with 3 channels high?

And do they sell their academic friends instead the Apple watch Ultra, The Bitalino Biometical Toolkit wich one ECG channel validated in a Sensors paper, ant the Matlab PPG peak detector, altough we are asking, which scientists use PPG devices for their research? Which scientists in general use the mentioned devices for their research? But …