Dad is a tool & die maker so, growing up, the "house tools" were Starret or Lufkin. (actually Lufkin set the standards that Starret strives for. But anyway . . . ) In the industry its all about confidence. Dad wouldn't show up for work with anything less than Starret. He KNOWS its square. The Tool God said so. Its an assumption with confidence. While he "calibrates / checks" tools several times a year he is confident that, in between, the tool hasn't hasn't changed or distorted. Not only is the finnished tool certified by the maker all materials going into it are certified before hand. Besides tools he judges a new guy by his tool box. Kennedy is the standard, Gerstner impresses but the guy rolling a Craftsman into a tooling room is really going to have to impress with their work.