We researched at least 20 combination squares and tested six, and we think the Irwin 1794469 12-inch Combination Square is the best way to mark a straight line.

What you'll learn: How to check blade alignment using a combination square or dial indicator How to adjust the trunnion or table top depending on your saw model Tips for aligning the rip fence and ...

Regardless of your skill level, a combination square is an essential piece for a woodworker. Here are our recommendations for the best combination square.