In the straight edge method, what item is used to measure height?

• A. A pen
• B. A ruler
• C. A tape measure
• D. A caliper

Answer: (A)

Height measurement with a straight edge relies on pairing a stable reference line with a measuring tool that can capture vertical distance. The straight edge gives you a true, level reference, but you still need a device that can read the height from the base up to the top. A tape measure fits this role best because it can span longer vertical distances and be read directly at the top once the edge is aligned.

A ruler is limited by length and is less practical for larger heights. A caliper is designed for precise small dimensions, not general height. A pen isn’t a measurement tool and won’t provide a numeric height. So, the tool to measure height in the straight edge method is the tape measure.