Cave detector / EM ground conductivity meter

[Atul Asthana]

http://www.caves.org/section/commele...s/splncs16.pdf

[rael]

Cave detector / Earth-Resistivity meter

A Radio Location Device for Cavers, pages 2-7.
Earth-Resistivity measurements for locating caves, pages 9-12.

http://www.caves.org/section/commele...s/splncs26.pdf

[decon]

EM ground conductivity meter

It is great method - simple and very effective to detect not only caves but metal objects also.