Are electrodes mostly homogeneous or are there variations by usage? My main usage is EEG. I have some interests in other areas and see similar electrodes sold for less money when marketed for different purposes.
I imagine there are differences in precision? Is that accurate or
Sorry for the basic question.
I've been experimenting with the use of electrodes for EEG and I'm trying to understand if these expensive EEG electrodes ordered from the EEG development board makers are "special" in some way that I'm not aware of - such as if different hardware designs detect different ranges of electrical activity - or if all electrodes styled for use on humans result in essentially the same data and just perhaps vary by accuracy?
Are there common metrics or features used to rate or distinguish electrodes by purpose?
Stated differently, my question is essentially what factors to consider when selecting an electrode for human use, such as EEG, ECG/EKG, EMG, etc.