I don't think you can get much more information than heart rate from a non-invasive device whose only input is the surface contact with your wrist. Electrical

I don't think you can get much more information than heart rate from a non-invasive device whose only input is the surface contact with your wrist. Electrical Skin Resistance ("Sweat sensor") would be possible to measure, but in my brief experience with it is very unreliable as the sole source of information, since you get the same physical response from many different causes.