The GSR is a handy tool
Galvanic Skin Resistance is a measure of electrical conductivity on the surface of your skin, which is affected by moisture and pore dilation. The more stress or arousal you are under, the greater the conductivity. This makes it a reliable indicator of relative stress or relaxation level. With two sensing plates, the GSR2 Biofeedback device painlessly gives the user feedback on whether he or she is getting even more relaxed! A needle on a gauge gives the reading. As you can see from the photo, Moe got pretty good at getting the reading to keep going down!