Thread Ring Gage Set Calibration ServiceThread Ring Gage Set Calibration Service When purchasing a new Thread Ring Gage Set, often times our customers need to have a Certificate of Calibration that is traceable to NIST to go with their new gages. Both Vermont Gage and Van Keuren Gage do not include a Certificate of Calibration with their Thread Ring Gage Sets off the shelf. This is a Service that needs to be ordered along with the gage at the time of the order. By adding this Calibration