Hmmm.... this is interesting...
I looked at their website (thanks Marc) and saw nothing that represented a requirement for calibration/verification. I thought that was odd.
There was no certificate with this? That is odder than odd.
What are you planning on using this device for? When I looked at the video on the website, it seemed they were using it for positioning and such.
A thought I had on this is if a verification would work. If you have some lathes and such with precise x,y,z measurements, you could make this instrument as part of a verification device in the system. Connect this gauge, and then move the spindle a certain distance and verify the displayed distance with that displayed by this 3-D sensor.
Another thought is contacting someone with some precise laser measurement and such. This sensor could be mounted and 'touch' a protrusion on a movable base. Then verify the indicated distance with that of the precision laser after the base was moved. This would be done for x, y, and z measurements.
Best thing I would recommend is contacting their office and explain what you are looking for.
Do assure that, given your use of this, that you have to calibrate it. Otherwise, maybe you can set up some kind of verification system in-house.