Hi 99,
It's Susan to my firends here on the message board. Lora is the offical ... sign your name on the dotted line handle.
I have c-thrus, incas and inexpensive rulers that you can pick up at Staples, Office Supply or just about any hardware store. My inca set is a t-square, which I love except that I can never find the mechanical pencil that goes with it
My ruler has a little added feature. I also purchased 1/16" cork board when I got my rulers. I cut a strip about 1/8" narrower than the ruler's width and super glued that to the center back of the ruler. For me that is the centimeter side as I use the English inches for my measurements.
That cork board does two wonderful things. First it grips what ever I am working on - basswood, birch plywood, paper. It never slides out on me!
Second it raises the ruler slightly above the surface so I can see under that thin lip of the ruler. I get perfect pencil placement that way.
Susan