Probably the most usefull tool when playing around with a laser cutter... They are already some of them on Thingiverse, we just wanted to make our own from scratch...
THIS USES THE METRIC SYSTEM (millimeters)
Using this tool, you'll be able to measure the thickness of a sheet of wood/acrylic/MDF... aswell as the diameter of wires/screws/sticks...etc
It goes from 0,50mm to 3mm with a 0,25mm step and from 3mm to 10mm with a 0,50mm step