As the site says, these systems are "strong-motion seismographs" usually
recording accelerations in the range of 0 to 1 g. They would be of
little use to most members of the PSN society.  Or, if you did want to
record strong motions, you could use off the shelf accelerometers as per
the PSN web site http://www.webtronics.com/strongmotion.html and
http://www.webtronics.com/adx05chip.txt

In this context, "low-cost" means it's a lot cheaper to squash a rod
into the ground than to drill a borehole and case it with plastic pipe.
I'm not sure I believe an "order of magnitude" cheaper (unless you don't
count bringing the rig on site) but substantially cheaper.  Cheaper in
this context means thousands of dollars instead of tens-of-thousands of
dollars.

Doug

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