A carbon-carbon composite plate for stamping is provided, the carbon-carbon composite plate having a porosity P of 20% or greater, and the stamping being carried out in the absence of water, or the carbon-carbon composite plate having a porosity P of 10% or greater, and the stamping being carried out in the presence of water. An amount of a detrimental substance in the wafer is measured to obtain a measurement result. Each material type of the multiple predetermined material types is associated with a corresponding best performing classifier from the collection of plural predetermined material classifiers by a predesignated stored association. , a brand name or a generic search word, or a voice or sound input or audio demand from the device speaker.