The first one showed cellulitis in the non-affected hand and the second one showed normal.

These are apparently used primarily as a diagnostic tool. It sure seems building a machine which will image the firings of the nerves would be far more effective. If they're correct about the mechanism of the disease it would give positive results even when you're not hurting.

Best of all is that It could be used as a preventive measure in first aid. It would have wide applications throughout medicine.