This I think it is a "must to have" .
It is great to examine stamps , coins and banknotes
The X4 gives you much details.
Also great for maps , reading "small words" , paper adds , charts and more . Put one at your house and one in your car! .
High-powered optical quality 4-inch round, 2X power lens with 4X power bifocal insert.
It features an unbreakable, scratch-resistant 4 inch lens.