Technicians use holiday detectors to locate coating discontinuities on pipelines, concrete, storage tanks, and other structures. However, detector accuracy can sometimes drift over time and producing selected output voltage becomes an issue. Improperly adjusted holiday detectors can either cause unnecessary coating damage due to excess voltage or fail to discover unseen coating defects such as pinholes and voids that can eventually lead to corrosion because of insufficient voltage output. For this reason, businesses rely on third-party calibration labs like ATS to ensure their holiday detector equipment continues to maintain its sensitivity.