ISO 26423:2009 "Determination of Coating thickness by pit grinding method for fine ceramics (advanced ceramics, advanced industrial ceramics) " specifies a method for measuring the Coating thickness of ceramics. The method uses cratering grinding techniques, which involve creating spherical pits on the surface of the coating and then examining the dimensions of these cratering by a microscope to determine the Coating thickness. This method is particularly suitable for coatings with smaller thicknesses, but not when the coating or substrate surface roughness exceeds 20% of the Coating thickness. In addition, the standard indicates the use of contact probes Profile Gauge as an alternative method for thickness measurement. ISO 26423 provides a reliable technical basis for quality control and performance evaluation of ceramic coatings.