OK, thanks Ron.I don't know how that link got crossed up. But here is another,
https://www.harryepstein.com/index.php/6-pec-solid-machinist-square.html
Not for a set, but it is PEC
I have a few "precision" tools from iGaging and I have been quite unimpressed with them. They are a set of 12, 24, and 36" precision straightedges that are poorly finished, have difficult to read markings, and are not straight -- all three of them!