Try something more along the lines of this:

http://www.instructables.com/id/RFID_Reader_Detector_and_Tilt_Sensitive_RFID_Tag/

There is a german group working on RFID issues and have created a  
device to detect RFID readers. more information ca be found here 
http://www.nearfield.org/2006/06/foebud-how-we-learned-to-stop-rfid 
  and the groups site: http://www.foebud.org/



On Aug 18, 2009, at 12:56 PM, James Costello wrote:

> Does anyone know of a device that could be used to alert when there  
> are RFID sensor around?  Something small, about the size of key fob.
> Something that might be good to have at say a computer security  
> conference.
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