So which EEG, ECG, EMG, etc. device should developers buy who are on a budget?

As we said before, most of the low-cost EEG devices which are currently on the market have issues: The best solution is according to our own little experience to build your own device, as Flavio Frohlich from the Frohlich lab did it: https://www.frohlichlab.org/ Or the one which is suggested here by Peter Gamma to built: …