Click on the picture to see the products.
Some fold into hard cases, some into soft cases; some swing closed, some click closed. These are what most people call, 'general purpose magnifiers' - for reading the small print on forms, labels in the supermarket, marks on furniture and porcelain. The advantage over a 'reader' is that they fit neatly into a pocket or small handbag.
See also, small powerful folding magnifiers (jewellers loupes), click here