Geophysical methods used in archaeology are largely adapted from those used in military uses, engineering, and geology. It is an efficient method for non-destructive archaeology and gives us a wide range of knowledge over a large area. Most applied in archaeology are magnetometers, electrical resistance meters, ground-penetrating radar (GPR) and electromagnetic induction conductivity meters (EMI).
Gaia Prospection is specialised in magnetometry and electrical resistance, mainly using Caesium magnetometers. These following cliparts try to explain magnetometer prospection in a nutshell, to give you a first impression of the application of geophysical methods. You may use them for non-commercial use, please mention the author.