The GSR2 sits in the palm of the hand. Feedback includes variable pitch tone. As tension increases, tone increases, as tension decreases, tone decreases. The goal, when using the GSR2 for relaxation, is to focus on the feedback tone and try to get it lower and lower, or just listen to it in the background as you focus on your breathing.
The GSR2 provides a relative measure of skin conductance, as opposed to an absolute measure. For relaxation purposes, one only needs an indication of whether a physiological signal is going up or down.
GSR2 Skin Resistance Monitor
Biofeedback Relaxation Training CD
Skin resistance range 1,000 ohms - 3,000,000 ohms
Variable frequency range 0 to 40,000 Hz
Resolution: <0.5% of base resistance
Power: 9 volt battery
Battery current in use: < 2.0 mA
Electrode Current: <45 microamps
2.5mm output jack for 8 ohm earphone and output meter