standard tile be re-calibrated ?
It has been seen that standard tiles kept in optimum conditions can become contaminated and change up to 2 GU in three years. Standard tiles used in “working” conditions will require regular calibration or checking. A period of one year between tile re-calibration should be regarded as a minimum period. If a calibration standard becomes permanently scratched or damaged at any time it will require immediate recalibration or replacement. The international standards state that it is the tile that is calibrated and traceable not the gloss-meter, however it is recommended thatthe instrument be also sent to an accredited service centre to verify its operation on an annual or bi-annual basis dependent on the operating conditions.
