The tool is typically used in the woodshop for measuring wood projects. It can also be used to measure any three-dimensional corner or a two-dimensional drawing.

The tool is an enhancement of the one I offered previously. The upgrades include: a larger size, embossed numbering, and a second color for the numbers. 

 I checked the accuracy with a digital angle measuring tool and found it to be quite accurate.  The photo shows a woodcut at 46 degrees as measured with this tool.  A digital measuring tool displayed an angle of 46.1 degrees.