Setting up for individual cuts often calls a combination square into play — on the table saw, router table and many other tools.
For square crosscuts, set the miter gauge square to the blade. Set the combination square's blade against the miter gauge and the square head flat against the saw plate.
Adjust the miter gauge for a 45° cut using just the head of the combination square. Just take the blade out and put the head on the fence and the blade. Avoid the saw’s teeth.
Thanks to the square head’s broad edge, a combination square stands on its own beside a router bit, freeing your hands to adjust the bit up or down.