You can see what it does just by looking at it, and what it does it does as well as might be expected, given the tiny, monochrome, OLED. It is a shame that the sample-timing steps are so few and far between – as a result of which you're going to have to tune your sine waves to accommodate the machine if you're hoping to raise any stimulating Lissajous patterns from its XY mode – But stimulate they do. And it turns out that having an oscilloscope within easy reach at all times is even more useful than I'd anticipated. Had this thing on the 40U travelling essentials rack within minutes, right next to the ES-8, and I imagine it'll stay there for quite some time.