Used during the calibration process of many measuring systems, masters are the primary dimensional reference and base for proper accuracy and precision measurements.

The masters' shape varies based on the application requirements, usually being manufactured as discs, rings or blocks.

Masters are manufactured with special processes that result in high thermal stability, mechanical ruggedness and controlled dimensional properties, such as circular run out and conicity.

Every master is supplied with a dimensional certificate, allowing periodically inspections and traceability.