Set-Up Measuring Tool

Woodworking is a tool intense trade or hobby with ruled strait edges for every possible situation.  Pictured above are just some commonly used squares used for measuring, laying out and scribing cut lines and assembly.  My favorite is the small pocket square, shown on the left side of the photo, fits nicely in to a pocket, and is graduated for fine layout marking.  Fully adjustable it is excellent for smaller work and is remarkably square.

Grizzly H7553 6" Adjustable Double Square 
Adjustable Combination Square 12"