Try getting a TRCIA system from the indipendent archaeology group in the UK.
You can purchase one for about 2 grand depending on the going rate of the
British Pound and it does just as well as a Geoscan instrument only you are
limited to a .5m spacing unless you build your own frames. But 2g´s vs.
15g´s it is worth the buy. ´Bob makes them by order so it can take about 4-6
weeks to get. The software is really basic but you can do some simple data
cleaning. I would recommend getting ArcheoSurveyor just google it and you´ll
find it.  A great geophysical software package that is designed for the
TRCIA meter as well as various magnetometers.  This software is also from
the UK and runs about $1000 US. Hope that is useful. Chris Rohe

>From: Stacy Kozakavich <[log in to unmask]>
>Reply-To: HISTORICAL ARCHAEOLOGY <[log in to unmask]>
>To: [log in to unmask]
>Subject: Soil Resistivity Survey Equipment?
>Date: Wed, 20 Apr 2005 15:19:20 -0700
>
>Hello List Members,
>
>I am interested in trying an electrical resistivity survey at an
>historic period site in Tulare County, California.  Does anyone out
>there have recommendations of specific equipment or software that have
>been successful?
>
>Thanks,
>Stacy Kozakavich