This NACE International standard test method provides descriptions of the measurement techniques and cautionary measures most commonly used on underground piping to determine whether a specific criterion has been complied with at a test site. This test method includes only those measurement techniques that relate to the criteria or special conditions, such as a net protective current, contained in NACE Standard RP0169. This test method is intended for use by corrosion control personnel concerned with the corrosion of buried underground or submerged piping systems, including oil, gas, water, and similar structures.