As Huey Lewis sings, "It's not that hard to understand, you see it every day!" It's pretty simple: an exact 90 degree right angle. I tested it with another square I have and they seem to be eating the others (both straight). This is an essential tool for any builder, fabricator, or any other person who wants to be right about everything. A warning: it's STEEL. So it needs love, care and WD40 to keep it nice and shiny. Hope this helps with the decision.
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