Another suggestion for a setup for validation of consumer grade sports sensors and for meditation research

1. IWORX XT TA 220: https://www.ebay.ch/itm/274885572961 Which is a similar device as used in: LabScribe ECG Analysis Module: ( $1000 USD) 2. Biopac data acquisition system Is it worth it to spend 4000 USD for a Gold Standard Reference Device? 3. Rasperri PI hat with 8 channels and 16 bit sampling rate fo 200 USD …