The oscilloscope kit that Gabriel of Gabotronics  sent me would fit in your watch pocket if you don't mind the pins. Or if you keep it in its electrostatic protective foam. The point is that it is a really small oscilloscope (1" X 1.6") suitable for embedding in your next project.
And it is not just an oscilloscope. It also has an arbitrary waveform generator and a logic analyzer included. You can read the details about its host of features at Xprotolab .
I'm going to do a more thorough analysis of the 'scope but that is going to take a little time (plus I have to buy a micro USB cable this evening to connect it to my computer). But I just couldn't resist saying a few words about it because it is so darned cute.
M. Simon's e-mail can be found on the sidebar at Space-Time Productions