Which measuring and marking tool is useful for a variety of layout tasks including checking 90-degree and 45-degree angles?

• A. Combination Square
• B. Bevel Gauge
• C. Measuring Tape
• D. Chalk Line

Answer: (A)

A combination square is a versatile layout tool that excels at both checking 90-degree corners and marking 45-degree lines. The square head and straight blade form a true right angle, so you can quickly verify that an edge is square to the reference surface by aligning the head with one edge and checking the other. Many combination squares also include a 45-degree marking on the head or blade, letting you set or scribe a 45-degree line with precision. Beyond angles, it serves as a ruler and depth gauge, making it a go-to for a variety of layout tasks.

Bevel gauges transfer arbitrary angles but don’t provide an in-place way to verify fixed right angles like a square does. Measuring tapes measure distances, not angles, and chalk lines mark lines but don’t ensure or test a specific angle.