Dip a sheet of plastic in some glue and let dry. Then dip in paint and let dry. mark on numbers with a screwdriver in white and cover in glossy seethrough paint. Or you could just go to a factory...
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Ruler
A ruler can be classed as a straight edge.
find a ruler with decimals.
Ruler
It is possible to construct a 20 degree angle using only Ruler and Compass. I happened to stumble across a method that is highly accurate. It is posted on my blog. Check the related link