So I'm doing a thesis and need to find the best sensor/wearable that has a open api so I can access the data, that measures gsr (galvanic skin response) and ppg (photoplethysmography).
I've seen a lot of bands but mostly discontinued (Microsoft band 2) and the e4 is really expensive (https://www.empatica.com/e4-wristband)
What do you recommend and why?
thanks in advance