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Volunteer "polygraph" operators are available free, for the asking, via The Church of Scientology.
The E-meter auditing device is a form of GSR.
Several other things you might consider:
EKG is pretty easy and cheap to pull off --- add some hand grips to a Polar heart monitor of the type that comes from WalMart.
You may have to provide some clean water so that visitors can get low enough skin resistance to activate the monitor's circuitry.
These heart monitors go into micropower mode (off) to preserve battery life unless there is a relatively low resistance path between the two electrodes.  The electrodes on the chest worn part of the heart monitor are fabricated from conductive polymer wires may be attached either by clamping a small piece of copper clad circuit board on top of the electrode using binder clips or by gluing wires on with conductive epoxy.  
Another interesting bio-monitoring device which may be used safely in public is the ultrasound Doppler stethoscope.  I found one on ebay for <$200.  
Reagan Cole
Durham, NC

-----Original Message-----
>From: Diana Issidorides <[log in to unmask]>
>Sent: May 10, 2007 2:40 AM
>To: [log in to unmask]
>Subject: Re: Polygraphs in museums
>
>ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>Incorporated, a worldwide network of science museums and related institutions.
>*****************************************************************************
>
>Hi Wendy,
>
>At NEMO, we have two excellent (and popular) polygraph exhibits based  
>on GSR measurement, both developed by the Experimentarium in Denmark.
>
>1. In "Measure your Emotions", visitors place their index and middle  
>finger on a metal holder that registers GSR while they look at  
>different pictures on a computer screen. They are then shown how  
>their GSR reacted to each picture and which picture produced the  
>highest GSR response.
>
>2. In Read my Mind (for two visitors), an 'interrogator' questions a  
>'suspect' whose fingers are similarly placed on a metal holder  
>measuring GSR. 'Suspect'  is asked to write down (a) 9 numbers and  
>think of one of them, or (b) 5 birthdays (one of which is his/hers,  
>or (c) 5 names of people (one of which s/he's in love with), and to  
>concentrate his/her thinking on that.  The interrogator then reads  
>aloud the items, while concentrating on the needle of the device  
>which registers GSR. It is quite easy to see what suspect is thinking  
>of, cause the needle gives a higher reading when interrogator reads  
>aloud the item that the suspect has in mind!
>
>Both these exhibits are robust and work well. I suggest you contact  
>Nils Hornstrup at the Experimentarium if you want more information.
>
>[log in to unmask]
>
>Good luck,
>
>Diana
>
>– –
>Dr. Diana C. Issidorides
>Senior Scientist & Exhibition Developer
>Science Center NEMO
>P.O. Box 421
>1000 AK Amsterdam
>The Netherlands
>T: +31205313119
>[log in to unmask]
>www.e-nemo.nl
>
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