The guys who built a medical and research grade ECG, PPG, EEG, etc. device for heart rate, respiration rate etc. themselves

Last Updated on January 10, 2023 by pg@petergamma.org

Dr. Christoph Guger and Dr. Günter Edlinger who founded g.tec medical engineering:

https://www.gtec.at/about/

90.02 Research & medical grade ECG devices which some of those were used to study the accuracy of consumer grade HRMs in different papers

according to our table, gtec medical devices start for hard- and software included at around 8000 USD up to 50 000 USD and more.