Who conducts the calibration of a gage and why? Gage calibration can be done by the owner or facility manager him or herself, it can be outsourced to a commercial calibration service, or it can be done by the original manufacturer who built the gage. There are pros and cons to each. Doing the calibration in-house can be a huge investment to set up the facilities, but can also save time and money. Outsourcing can guarantee that specialists complete the calibration, but can lead to long turnaround time. Going back to the manufacturer ensures that the gage is in the same setting it was originally built and tested in, but can also add to the time or cost of moving the machine. Usually, gage owners will use a mix of these three options dependent upon the work that needs to be done and the speed with which it needs to be done.