Ten years ago I bought Zebra’s tiny TS-3 mechanical pencil. Back then it cost £2.50. These days it’s a bit more expensive, but is still quite affordable.
You’d think that a pencil with such a small size, it’s only 10 cm long and has a diameter of just over 5 mm, it can only be used if no better pencil is available..
..but the truth is that it’s much more comfortable to use than many other emergency pencil, i.e. the kind of pencil that comes with some of the Swiss Army Knives.
In May I put a video review online that provides some more information about this pencil.
It might not be your best choice for a daily writer, but it’s certainly a good choice for a pencil you can store in a pocket or bag so that you have a mechanical pencil when you need it. The comfort to size ratio is certainly better than what you might expect.