Arkadaşlar burada Earth Resistivity Meter yazan 2 adet proje var.İsterseniz bakabilirsiniz.Hatta Data-logger bile var.
http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=geo&file=projects.dat (http://www.geotech1.com/cgi-bin/pages/common/index.pl?page=geo&file=projects.dat)