I think I may have found an easy off the shelf data logger and software package. It is made for metal detectors, but should work for Carls rig. It uses the audio out from a metal detector so it should work for teh gradiometer also. I will email them and see what they say.
Here is the link to it.
http://www.lrlman.com/Pages/AG_Mini/AGM.htm
Fitz.
Here is the link to it.
http://www.lrlman.com/Pages/AG_Mini/AGM.htm
Fitz.
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