Squares - Choosing and Using Them in the Workshop -- A woodworkweb.com video

http://www.woodworkweb.com/woodwork-topics/work-shop-tips/412-make-it-accurate-with-the-right-square.html : Making good joints and wood projects that fit together nicely begins by having your machinery set up accurately, and the only way to do that is to make sure you have accurate squares to do that with. In this video we look at different squares and which ones are more suited for setting you equipment more accurately and which ones are for rougher construction work.