Every good Starfleet Engineer knows that it is always a good idea to boldly take a notebook with you while going where no person has gone before.
The United Federation of Planets Starfleet Engineering Notebook not only has 48 grid pages for jotting down notes, it also is filled with useful information. For instance, it includes phaser, fleet communicator, and tricorder schematics. This is perfect, because you really never know when you will need to build one on the fly. Also included are useful quotes from other Starfleet Engineers. This way you can always sound like you know what you are doing, even if maybe you don't.