We are in the process of extending the calibration interval of a class of IMTE (small Micrometers) based on a statistical analysis per NCSLI RP1. My question pertains to the instrument labeling and certificates required for documentation. We would like to do the next calibration at the extended time period, to skip the eliminated cycle, but the instruments are currently stickered and certified at the shorter interval. Is there any experienced guidance on options for documenting the new interval, short of recalibrating every IMTE to the new interval? For example, re-stickering them would address the individual gauge identification concern, but would we also need to have all new certificates printed (they are externally calibrated)? Could we prepare a "Blanket" document stating the Serial #s that have new dates vs. those on the current certificates and record that? Of course, simply re-calibrating them to the new interval is an obvious answer, but I'd like to know if this is the only option. Any experience or accepted practices would be appreciated.