GSR2 Biofeedback Relaxation System including Bio-Q Stress check card ($4.95 retail value) Review

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(More customer reviews)At first, I was impressed with how well the audio tone followed my level of relaxation.
Then I noticed a glitch when using the GSR2 upside down (the manual said upside down was allowed). The more I relaxed - the tone actually got higher (not lower as expected). I deduced that this was because as my finger knuckles relaxed, it provided more surface contact with the sensors.
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.
SUMMATION:
There are two influences when measuring GSR. The "small grain" factor is the skin's actual electro-dermal activity. The large grain factor is the physical contact (surface area/ pressure) between the galvanometers and the fingers. Only when the large grain factor is maintained at a constant, can any meaningful data be extrapolated from the small grain variable. It is my belief that not only can't the GSR2 gauge the small grain data, but its tonal pitch relies totally on the large grain factor.
It would be more accurate to state that the GSR2 expresses relaxation level by measuring the degree at which one's finger muscles relax as they're rested on top of the sensors. I could have just as easily held a rolled up magazine in my hand, and monitored how it begins to slip from my grip to determine how relaxed I've become.
The GSR 2 sales rep that refunded my money asked me to write the above, so that he could send it to the device's design team. The team was then supposed to send me a rebuttal. That was 3 months ago. I never heard anything back.

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The GSR 2, home biofeedback device precisely monitors your stress levels by translating tiny tension-related changes in skin pores into a rising or falling tone. By resting two fingers on the sensing plates you learn to lower the pitch and your stress level. Cordless finger-rest sensor - with built-in-tonal feedback - automatically measures galvanic skin resistance (GSR). Uses a 9V battery (included). Free wallet stress Stress Check Biofeedback card ($4.95 value)adds the ability to do temperature biofeedback.

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