Thank you for the answers.
That is part of the problem. How do you read description (spesification) that is not very good:
Toolmaker Precision Micro Adjustable Angle Block Milling Setup
Material: steel, surface hardened to HRC58-62 °, nickel plated.
Dimensions (LxWxH) 75x25x32 MM
Angular Precision 10 'On Readable Nonius
Micro Adjustable 0 ° To 60 ° With Stop Scr
Uses: In the milling machine, planer, drill press with adjustable angle grinder and regulations on the knife, crossed with other fixtures or clamping the workpiece after the workpiece processing, such as processing slope, slant-hole drilling and the like.
Nickel plated, rust parallelism and verticality precision grinding of each working face to 0.01mm.
It can be a cursor indicates stepless tilt adjustment angle, and then be secured with screws, used to create a variety of fixed angle processing, testing of workpieces.
I'm tempted to claim that "rust is not parallel to verticality to 0,01 mm".
The example of 1-2-3 block is good. They would be completely useless if parallelism would be bad. And pretty near useless if they were not square.
With this V-bloc, the V- must be very true to all working planes and bottom surface. That is the must and I should have a look at it, but it looks fine.
However I don't think it would be reasonable to expect external working surfaces to be accurate to stated number (0,01 mm) unless otherwise mentioned. Bit like parallels....their opposite surfaces has to be parallel to great degree, ends have very little consequence, but you don't expect beaver bites there either.
My analogy would be here try square. What about if you think that you buy a flat square and one side is beveled unevenly? I'm not talking here hair line, but the case that other side of the square is square and other not.
Re. scales...I feel that scales must have more than entertaining values. There are bunch of DIN standards that pretty much states what accuracy scales should be each type of tool and accuracy glass. Here no DIN number were mentioned, but there is this statement "Angular Precision 10 'On Readable Nonius". I agree, it is not for measurement, but that should help the set up.