Doug, I have seen gear like this at the USGS in Menlo Park. Maybe John
Lahr can comment. It was about 4 years ago and Chris Detel, a USGS tech,
who had moved from the seismic group to the volcano group, was working
on a remote sensing system for use around active volcanoes. These sure
looks like some of the same type of stuff I saw sitting on a test bench.
$750 seems like a low bid for this type of gear. The stuff Chris had
also functioned as an array.

Regards, Steve Hammond PSN San Jose 

Doug Crice wrote:
> 
> Does anybody recognize these "seismic sensors"?  Since they come from
> the area of Mt. Hood, might they be micro-earthquake gear for tracking
> volcanos?
> 
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=460949352
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