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Where can it not be used?
The OhmMapper is not recommended for the following:
1) On concrete or other materials containing rebar. It should be at a distance greater the depth of investigation over a long, parallel metal structure such as a metal gas pipe line or a railroad rail along the path of the profile line.
2) In confined areas where there is not at least 40 meters to maneuver.
3) When the depth of investigation is over 20 meters, even in highly resistive areas, or when the depth of investigation is over 8 meters in sites of less than 20 Ohm-meters (high clay content or saline groundwater for example).