On the other end of the scale, there are ornamental magnifying glasses, designed for light use, but more often wind up as a curio to add to bookshelves and cupboards. Somewhere in the middle ...

The screws that go in your phone are minuscule, and a magnifying glass is really handy if you want to check out the detail on your 3D prints. While this is easy if you have good eyesight and you ...