Definition - What does Calibration Plates mean?
Calibration plates are devices used for the correlation of readings obtained from an instrument to ensure its accuracy. They are typically used for thickness gauges with a dry film.
Corrosionpedia explains Calibration Plates
Instrument calibration is one of the fundamental avenues used to ensure system accuracy. Calibration plates play an important role in facilitating this. This is due to measurement standards and units often varying from one country or region to the other. Calibration plates assist in ensuring consistency and easing the sharing of information within and between such regions.