They will be used as a shop set to check holes during machining processes. I want a way to calibrate them without sending them out...any suggestions much appreciated!
Yeah, these are the pins at greatest risk. They will be used to check holes on a regular basis, which leads to their being used as defacto deburring tools the first time they don't clear a hole being checked. Also hole depth is a factor - if the hole in question is .250 deep, that's a different issue than if it's an inch deep - pins get bent as well as worn.
What tolerances need to be held ? If it's a thousandth or two, it's a different issue than if it's all about tenths.
Assess the costs of replacement vs the cost of calibration. If it was me, and the situation was in thousandths, I'd not calibrate them - I'd use a micrometer, and maybe a surface plate to check them with periodically and then replace them when they showed wear signs. After a while you may learn how often to replace them and can consider just doing that.
Now if it's out into tenths, that's a different game.