Measuring of 100 mm gauge blocks

4 markers = 0.56 mm (2 markers = 0.28 mm)

First, I pasted 4 markers on top of one another, and measured their thickness: 0.56 mm
So the thickness of one marker: 0.14 mm. Thickness of two markers: 0.28 mm

I pasted two markers, one opposite the other, onto a 100 mm gauge block.
Next, I scanned these markers and measured the distance between them.

Gauge block 1Gauge block 2
1100.284100.179
2100.278100.217
3100.312100.214
4100.329100.235
5100.312100.213
Average100.303100.2116

The measured length of gauge block 1 = 100.303 – 0.28 = 100.023 mm
The measured length of gauge block 2 = 100.2116 – 0.28 = 99.9316 mm

Such a big difference can be explained by the different thickness of the markers.

3D scanning of the gauge block