A metallic coupon in the nature of a probe to measure and assess the corrosion and cathodic protection level of buried pipeline, storage tanks, reinforcing bars, water main and other metallic structures susceptible to corrosion or protected by electrochemical protection; replacement parts for the above-identified metallic coupon; dedicated meters for the above-identified metallic coupons for the purpose of measuring IR free potential and current density; system comprised of metallic coupons a...