Take a look at this one folks, it is a set of three actual earthquake
seismometers on ebay.  One vertical, two horizontals and some
electronics.  Sean could probably tell you what they are, but they look
like short-period sensors.  United Electrodynamics was one of the
predecessor companies to Teledyne UED later merged into Geotech.

Here's the link:

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&tc=ps&item=458889972
-- 
Doug Crice			 http://www.georadar.com
19623 Via Escuela Drive		      phone 408-867-3792
Saratoga, California  95070  USA	fax 408-867-4900

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