Practical calibration cube

This is a die-shaped calibration cube with 20 mm in the x, y, and z axis.
The description of each surface is as follows

| Surface | Description |
| ---- | ---- |
| 1 | Diameter 10mm circle |
| 2 | Arabic numerals 2 |
| 3 | Chinese numerals 3 |
| 4 | 1 side 5mm square x 4 |
| 5 | Roman numeral 5 |
| 6 | 4mm diameter circle x 6 |