Novelty pens aren't really our thing here at Cult Pens. We have more respect for the humble writing instrument than to fall for such cheap tricks. A few cases so far have been special enough for us to go for, though - these tool pens are no mere novelties.
The Messograf is a classic of its type, incorporating a calliper gauge with a vernier scale; and it can measure the depth of your tyre tread. Monteverde's tool pens are nice pens to use in their own rights, but add tool-like styling and a few neat tricks. They include a ruler and a screwdriver, have a capacitive stylus for phones and tablets, and most models even have a spirit level.