What's the difference between the two?
I think there is a reduced set of conditions that have to be met for verification vs. calibration.
One thing I have seen are 'records' stating that 'calibration' occurred, yet the records did not indicate environment at time of the event, or standards used, or their calibration status. Standards such as ISO 17025 requires a controlled environment, among other things. I didn't find those to be effective records, then.
At another shop, they have a list that gets signed where they check a gage pin before taking it from the bin with the available calibrated micrometer. They sign the pin was verified before use.
Calibration can be done in house, but like everything else, the operator must be qualified, the correct tools must be available and fit for function, and the procedure must be established and appropriate.