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What are its limitations?

The biggest limitation is limited depth of investigation. In most sites the maximum depth will be between 6 to 12 meters. Like all resistivity instruments it will not get good data over long metal structures parallel to the direction of the survey and within the depth of investigation. For example if the depth of investigation is 4 meters and you are over a buried metal gas line which is at 2 meters depth, or surveying next to a railway track 2 meters away, you will not get reliable data.

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