Master calibration rings are used for calibrating high precision measuring equipment or comparator. In most cases user used the ring as a reference standard. This standard will be the master for all precision measuring equipment and are traceable to the national lab.


Master Ring are specially treated with high and low temperature treatment. With several cycle of tampering. This can avoid the steel material from growing after years of storage.

Material – Tool Steel, Solid Carbide, Ceramics.

Tolerance – Class X, XX, XXX

All rings are calibrated and the actual size will be engraved on to the ring surface.

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