bonesbr549 said:Here's what I use. I picked them up at woodcraft for 39 bucks they have been really handy and I keep them in my wooden case. They are good to .00015 wich is good enough for a medium that moves on its own.
http://www.woodcraft.com/Product/2020413/21000/3-Piece-Engineer-s-Square-Set-with-Case.aspx
I bought these squares from woodcraft, took them home and tested them. All but 1 was close to being square, I took them back. I will never buy a 3 pack of squares for 39 bucks again. You get what you pay for.