No, like a wrote a post above yours, he calibrated his device on an old sleeve.
This may sound harsh, but I think he screwed up. Calibrate on the china wall, it's the same material and it's easily measured with a caliper. Worst case, at the top of the cylinder where the deck is solid.
There is no way that measurement is correct, buy a tool for yourself or find a second guy with a different tool or some other way to validate.
