Re: Gage Calibration Stickers in harsh environments - Are Calibration Stickers Requir
It's all been covered so well, there's not much more I can say. But for the sake of getting in some sort of comment...
There is no universal requirement that a "CALIBRATION STICKER" must be on units. The requirement (generally speaking) is to assure that only currently calibrated units are used, and that users are able to identify that the unit is currently calibrated.
Most of the time this is done using stickers/labels. However, as has been well covered above, there are many other ways to do it. As I may have alluded to in posts in the past, I had a quality director once argue (successfully) that in certain conditions, there was no need for a cal sticker, and that it was to make the auditors happy.
The circumstance was a fully automated factory (semiconductors) where we worked. Any test equipment used had to be logged in using a bar code, which was connected to the maintenance/production database. If the instrument was past due cal or not properly calibrated, the production database would not allow it to be used. Therefore (as alluded to above also), the cal sticker would have been just a convenience.
So bottom line for the original poster, as long as you have a reasonable method (which complies with your quality system) to assure that only properly calibrated units may be used, and/or users have an unambiguous method to know the calibration status of the unit before using it, then it should be fine.
If the decision is to have a gage board, engraved information, and/or what ever may be needed, it should be fine.