As a design engineer, I'm familiar with lie detectors, so I decided to emulate finger tip galvanometers by strapping several rubber bands between my fingers and the GSR2. This test showed that no matter how deeply relaxed I became (I'm trained in deep relaxation techniques), the tone stayed constant in pitch. IE: constant pressure and surface area resulted in a constant tone.
Amazon.com: The GSR Temp 2X Biofeedback Relaxation System: Health & Personal Care
