Tri-Recs Rulers/Tool
I think it would be useful/helpful if the rulers/tool or the packaging had something on them/it saying that this is NOT a 30-60-90 or 60-60-60 ruler.
or
This tool is NOT suitable for hexagons.
I think, to the casual observer, that they might look like they could be interchangeably used - but that does not work out well.