One thing I always worry about with fixed-blade metal try squares (especially beautiful and expensive ones) is the reality that rough handling or an accidental drop from the workbench can knock them out of alignment and render them useless. The new 4″ x 6″ square by Blue Spruce Toolworks has an answer for that. Instead of being fixed with pins, the hardened steel blade is fixed on an integrated pivoting mechanism and, with the aid of two thoughtful set screws, can easily be adjusted for a lifetime of accurate use.
The mechanism itself is robust, and I found it nearly impossible to knock the square out of alignment. In the end I loosened the screws to simulate misalignment, but within a few seconds I was able to reset the high-carbon steel blade to dead square and get back to work.