I believe that this is a 3-component force balance accelerometer. 
Kinemetrics made them from scratch in order to produce a
reasonably-priced product.  It triggers on an earthquake and sends
analog data to a central recording system.  It predates modern MEMS
accelerometers, will only detect strong local earthquakes, and should
only be purchased for a lot less than this vendor thinks it's worth. I'm
sure Larry's system will be better and reasonably priced.

RADIOTEL@....... wrote:
> 
> TO: ALL LIST MEMBERS
> There is a Kinemetrics TS-3 Seismic Sensor on Ebay #1657596668.  Current bid
> is $102.00.  I have no idea whether it is a strong motion sensor, long period
> sensor or broad band sensor.
> __________________________________________________________
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