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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF / VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures.
Large areas can be scanned in a day. GPR work is non-invasive to those around you, so work can be done with other trades at the same time. GPR work can be performed at a fraction of the cost of concrete x-ray with no need to evacuate the area or place film on other side of wall or floor.