magnifying glass

US /ˈmæɡ.nɪ.faɪ.ɪŋ ˌɡlæs/
UK /ˈmæɡ.nɪ.faɪ.ɪŋ ˌɡlæs/
"magnifying glass" picture
1.

a convex lens that produces a magnified image of an object

:
He used a magnifying glass to read the small print.
The detective examined the evidence with a magnifying glass.