I backed this guy's Xprotolab mini oscilloscope, and it's a really handy piece of gear. Bigger than a watch, but not by much, a case with the scope, probes, and everything else fits comfortable in my toolbag. I've used it a couple of times and it seems to work pretty well for the price.
This is just amazing! It feels like suddenly creating a new market. It has the potential to change the way customer service is addressed in the field: for washing machines, data loggers and may be hundreds of devices.