Such an arrangement may well be suitable for measuring pipe to soil {TAIL ~ potentials} of a cathodic protection system for pipelines wherein access to the soil in the vicinity of the pipeline at selected points of {HEAD ~ measurement} is not practical 
Such an arrangement may well be suitable for measuring pipe to soil { TAIL ~ potentials } of a cathodic protection system for pipelines wherein access to the soil in the vicinity of the pipeline at selected points of { HEAD ~ measurement } is not practical
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD OTH OTH OTH