For shop use, a regular pencil is preferred to a carpenter's pencil, and it needs a sharp point for maximum accuracy.
This clip-on pencil sharpener, which handles regular and fat pencils, goes where you go and can be used one-handed.
Suggested by a customer, it was too practical to resist. We had to order the two components from opposite sides of the world and decided to make the clips available separately so that you could portabilize (you're right, it isn't a word!) other tools as well.
High utility, low cost – the best of all worlds.