magnifying glass

The shell is covered all over with fine lines, but they need to be looked at through a magnifying-glass, they are so fine.

Every night I shut myself in, all alone, and studied the day's thumb-prints with a magnifying-glass.

True, under the magnifying-glass the foliage looks crisped, as is noticed after a first frost.

He was examining a piece of china with a magnifying-glass when I entered.