Starrett Tru-Stone offers calibration services in our Waite Park, MN factory. Granite accessories and extremely worn granite plates must be resurfaced and/or calibrated in our factory. Should you have several plates due for upcoming calibration, you may be interested in obtaining a quote to have our technicians perform those services on-site. Our calibrations are NIST traceable. We are ISO 9001 registered and A2LA Accredited per the ISO/IEC 17025 Standard.