By using a magnetometer to detect the magnetic properties of remains underground and features underground, archaeologists can find many different kinds of finds like pottery, tile, iron objects and even burnt soil. This is because all materials have unique magnetic properties.

^{© Darent Valley Landscape Partnership (DVLPS)}

Electrical resistance meters record when an electrical charge is resisted by materials underground. Archaeologists can build up an understanding of what kinds of remains might be in an area by comparing how resistant different materials are to the electrical charge.

^{© Darent Valley Landscape Partnership (DVLPS)}

Ground-penetrating radar uses electric waves bouncing off of objects to build up a picture of archaeological remains underground.

^{Ground Penetrating Radar image of a Roman road in Sussex © David Staveley}