The present invention pertains to apparatus and {HEAD ~ methods} for measuring {TAIL ~ potentials} between buried pipelines and the soil wherein the pipelines are connected to a cathodic protection system and are disposed in urban areas, in particular 
for measuring
The present invention pertains to apparatus and { HEAD ~ methods } for measuring { TAIL ~ potentials } between buried pipelines and the soil wherein the pipelines are connected to a cathodic protection system and are disposed in urban areas , in particular
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH