There is a device in Russia that give you same information of earth resistivity and conductivity. It works great with Golden Software, so you can receive 3D image of conductivity difference in the ground. It can detect any metal objects from 15x15cm also with this device you can find caves and any dielectrics (of course with good contrast of ground).
It generate em field from 2,5kHz to 250kHz, it penetrate 10m.
The cost of this device is 15 thousand euro (basic set). The manufacture is Geophysics institute of Russian Science Academy.
They patented the device from 1996 but start to sell only this year. They have many good feedback from archeologists and geophysics.
You can find more information here:
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http://www.nemfis.ru/
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