Stand for micrometers. I just added a little longer screw for a better fit to the original model.
Update Nov. 2022:
For enough strength use PETG and print the Screw and Nut with 100% infill to make them stronger. For more grip and less force on the screw: Glue 2 rubber pads on the inside of the clamps.
Update2 Nov. 2022:
Also added a version mcstnd_knoblangfull without the hole to gain even more strength for the screw.
The user re-uploaded this model. The user is not the original author of the model.