What can you scratch to measure?
stoma bone yardsticks diamonds rulers distance hairs measuring tape
A B C D E F G H
Diamonds are so hard because of the shape of a diamond's structure.
measuring diamonds requires scratching them
What can you scratch to measure? (A) stoma (B) bone (C) yardsticks (D) diamonds (E) rulers (F) distance (G) hairs (H) measuring tape