ELIF: What’s the difference between a number 2 pencil and a pencil that isn’t labeled number 2? And if number 2s are almost always required why not just only make number 2 pencils?

Question

ELIF: What’s the difference between a number 2 pencil and a pencil that isn’t labeled number 2? And if number 2s are almost always required why not just only make number 2 pencils?

In: Engineering

Answer 1

The hardness is one factor of the pencil, but #2 pencils are used for scan-tron tests because the machines which read answers (the filled bubbles) will recognize a marked answer based on the shininess and reflection of the graphite on the paper.