If you've never used a loupe before you will marvel at how 'big' everything appears; if you have ever used a decent loupe you will be puzzled as to why this one is difficult to focus and the image is a bit wavy. This is what you get for £4.50 . Compare this with a Zeiss 10X loupe, no box, all plastic, and it costs £89.00. The difference in price reflects the difference in the quality of the lens.
These are very popular at the antiques fairs with customers who want the cheapest professional-looking 10X-magnification loupe, though these customers don't actually look through it before buying, they just want the largest and cheapest.