Three Geotech S-13 seismometers are for sale on eBAY:

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1684963900

The price is outrageous and I'm alarmed the seller has opened one up
for a picture!  Buyer beware.  These instruments are pretty good if the
bottom seals in the case are intact.  Otherwise, corrosion eats them
up fast.

Bob, APSN
Fairbanks, AK

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