Verifying Speed Square Accuracy

What happens here

It's important to periodically check if your speed square itself is accurate. To do this, place the speed square's fence against the edge of a straight piece of wood. Draw a line along the straight edge. Then, flip the speed square over, align its fence with the same edge of the wood, and carefully align the straight edge with the previously drawn line. Draw a second line. If the two lines perfectly overlap, your speed square is accurate. If there's any gap or deviation, the square is not perfectly true. The presenter recommends performing this check periodically.

Goal: Ensure the speed square itself is accurate for precise measurements