Depends on how accurately the blocks are made. For perpendicularity it also depends on how perpendicular the mag-base is to itself. It's better to check the parallelism using the granite because it is likely to be calibrated and much flatter than the 1-2-3 blocks. If the granite is properly flat then the tolerance is basically whatever the tolerance is on the indicator. There is another small mistake in this video though in that he only took each measurement along a single axis (moving the part side to side left to right). He should have also taken measurements forward and back along the entire surface. If you only check left to right you are basically checking one line to a plane instead of a plane to a plane. Also when checking any of these features make sure you are using the datum side as the zero (datum should be touching the granite) according to the print. I know your question was two years old but hopefully that is helpful for you or someone else
Tolerance how much?
Depends on how accurately the blocks are made. For perpendicularity it also depends on how perpendicular the mag-base is to itself.
It's better to check the parallelism using the granite because it is likely to be calibrated and much flatter than the 1-2-3 blocks. If the granite is properly flat then the tolerance is basically whatever the tolerance is on the indicator. There is another small mistake in this video though in that he only took each measurement along a single axis (moving the part side to side left to right). He should have also taken measurements forward and back along the entire surface. If you only check left to right you are basically checking one line to a plane instead of a plane to a plane.
Also when checking any of these features make sure you are using the datum side as the zero (datum should be touching the granite) according to the print.
I know your question was two years old but hopefully that is helpful for you or someone else
that is not perpendicular check
Your magnet is not perpendicular. Period.