The standard describes methods for the measurement of surface wetting time (TOW) in atmospheric corrosion testing. The standard is suitable for monitoring surface wetting time when exposed to periodic atmospheric conditions and can be used to detect condensation in wall or roof assemblies. Measurement of wetting time can significantly enhance the calibration and characterization of exposed sites, especially when used in conjunction with Miscellaneous field instrument data. The standard specifies values expressed in the International System of Units (SI) and reminds users to establish appropriate safety and environment practices prior to use.