I have a 6" Starrett that is over 50 years old, a Craftsman 12" that is over 40 years old and an Empire 18" that is 2 years old. All check out with a machinist square and each other. There is little doubt the the quality order is the same as I stated them in but even the Empire gets the job done as it is used infrequently. The 6" Starrett is my go to square for 90% of the work I do.
Education is what remains after one has forgotten everything he learned in school. Einstein
In my shop I remove the "S" from scrap wood.