If we want more than one ECG channels, it is worth looking at these devices. Kits do not include any sensors:
Biosignalsplux Explorer Kit (4 channels) 770 USD:
Biosignalsplux Researcher Kit 8 (channels) 2.990 USD:
We need to explore this further and do more research to find out the exact difference between explorer and reseracher kits. If we want to find out more about PLUX Biosignals, whatch the Biosignalsplux Youtube channel:
https://www.youtube.com/channel/UCcWcxxG5TrksCFyDodY4ymw
which was founded on May 31, 2022, with 76 views and 2 subscribers to this date.