The main difference from most other calibration tests is that the corners are clipped so that you can easily measure the X-Y skew of you printer. Nothing too fancy.
You can fix either try to fix it mechanically or use a gcode compensation tool.
GSuite is an example. You can downloaded in this [link].
(http://pilotpage.monosock.org/fileadmin/files/Gsuite_v1.4.rar)
Category: 3D Printing TestsThe author marked this model as their own original creation. Imported from Thingiverse.