Swanson Tool Co S0101CB Speed Square Layout Tool with Blue Book and Combination Square Value Pack is $15.40 at Amazon.
Includes:
Speed Square
6" Combination Square
Blue Book (Roof and Rafter Layouts + Formulas)
-Other sizes also available on link.
https://www.amazon.com/gp/product…UTF8&
https://www.amazon.com/gp/product…UTF8&