• magnetometers
  (airborne, land & marine)
• seismographs
• spectrometers & scintillometers
• borehole logging
• conductivity mappers (Stratagem),
• ground penetrating radar (GPR)
• electromagnetic exploration equipment
• magnetotelluric and DC resistivity equipment

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• magnetic susceptibility meters
• mapping & contouring software
  (Surfer, Didger, Grapher, MapViewer, RockWorks, LogPlot, etc.)
• groundwater modeling & visualization software

 ... and more