It doesn’t matter, if your bore isn’t perfectly perpendicular you get a misread with an optical system like that. I’ve had most of not all of those devices in front of me for a demo. None of them were accurate measuring a gage block for the same reason.
Yep, new Mitutoyo 00 blocks, with cert, temperature controlled space, and the Keyence rep doing the measurement. I wanted it to work, needed something that could do what they claimed and had the money if it worked. What’s your interest?