The AS1 works amazingly well for such a simple mechanical system with 
moving magnet.
I've posted information here on the system:  http://jclahr.com/science/psn/as1/

However $150 is quite steep for a used transducer without 
amplifier/filter/AD unit.

Cheers,
John

At 07:19 AM 8/14/2005, you wrote:
>Hi gang,
>
>     AS1 Seismometer, Excellent Condition
>         Item number: 6200926939   ends Aug 20
>
>This is a vertical but has a rather short period.
>Bob
>
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