Engineering Square

FEATURES:
Checking edges and ends of boards to see if they are square with adjoining surfaces
Checking the width or thickness of narrow boards
Checking flatness
Laying out lines perpendicular to an edge or side of a board
Measuring short distances

SPECIFICATION:
The try square has a blade (straight edge) and a stock (beam), which are fixed together at exactly 90.
The stock is much thicker than the blade.
The edge of the blade and the stock are perfectly sharp and straight.