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"Yes, if they are not too badly worn. Our factory setting and equipment allow the optimum conditions for proper plate calibration and rework if necessary. Generally, if a plate is within .001″ of the required tolerance, it can be resurfaced on-site. If a plate is worn to the point where it is more than .001″ out of tolerance, or if it is badly pitted or nicked, then it will need to be sent to the factory for grinding prior to relapping.\n\nGreat care should be exercised in selecting an on-site calibration and resurfacing technician. We urge you to use caution in selecting your calibration service. Ask for accreditation and verify the equipment that the technician will use has a NIST traceable calibration. It takes many years to learn how to properly lap precision granite.\n\nTru-Stone provides quick turn-around on calibrations performed in our factory. Send your plates in for calibration if possible. Your quality and reputation depend on the accuracy of your measurement instruments including surface plates!"
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