We are not allowed to use devices that are not calibrated at least according to ISO.
If, for example, I were to allow the SDM3045X to be used for measurement/adjustment after purchase, even though these multimeters did not have the appropriate documentation, this could result in the recall of devices already delivered and tested with them, with the corresponding costs.
Therefore, all new purchases without protocols are first calibrated externally before they are used even once here.
It is completely irrelevant whether this makes technical sense or not, it is about the complete traceability.
The seriousness behind this can best be understood by the following example:
Assuming a product is tested with a calibrated measuring device, the measuring device still has a valid calibration.
If, however, during the next calibration it is determined that the measuring device is out of tolerance, even if it is only in one range, then it is determined which products were tested during the time between the two calibrations.
And those would then have to be measured again.
If we are unlucky, they are already at the customer all over the world...
For private use, of course, this is irrelevant.