Table 5. Distance measurements on certified gauge cubes.

Step-size (mm)	0.500	0.100	0.050
Measured mean (mm)	0.517	0.112	0.065
Std (mm)	0.005	0.006	0.005
Relative error	3.45%	12.67%	30.83%

Note:

The reported measured mean refers to the distance between the vertices of the top plane of the step-cube (1.50, 1.10 and 1.05 mm respectively) and the reference cube (1.00 mm).