Testing Automotive ECUs
While it's not the most amazing piece of equipment I've ever seen, I got a digital oscilloscope for Christmas that has turned out pretty handy. It's one of those tools that when you need it, you need it, there's not really a substitute. Thing is about the size of a cellphone. Menus can be a little tricky to figure out and I'm sure it's not the most accurate thing in the world, but it's super portable and does a good job of at least giving you an idea what a signal is doing. Fairly affordable too when compared to larger bench style units. Think it was probably under $200-300