Faro silver arm

I have been looking for a Faro arm for some automotive reverse engineering. I have found a Faro Silver and wanted to know if anyone here has experience with them? The tech sheet quotes +- 30 thou/076mm and this is quoted as a single point cone test. Does anyone know what this test refers to? I’m wondering if this pertains to the full working volume? I’d also like to know if the arm is a little more accurate if used in a more slrestricted space. I.e if measuring a cylinder head using only limited movement is it going to have better accuracy? I realise that this is old kit and likely to be well out of calibration, but don’t know just how far they can fall out of calibration. Ultimately I’d like to be able to use this in conjunction with an Einscan to get firmer details on scans by provoking things like bores, bearing centres and bolt locations. I’d love to know the thoughts of those metrologicalltly wiser than I on this.