magnifier

US /ˈmæɡ.nɪ.faɪ.ɚ/
UK /ˈmæɡ.nɪ.faɪ.ɚ/
1.

kính lúp

a device that makes objects, text, etc. look larger:

:
The company's products include hand-held magnifiers and large-print playing cards.