This is an essential, PC attachable miniature digital oscilloscope (DSO) that is especially useful for audio or low frequency digital circuit troubleshooting. This kickstarter funded line of DSOs has the essential features needed for audio/low freq work (under 200khz):

The good:
* dual trace, 1M ohm input
* dual digital voltmeter display
* frequency counter
* built in basic wave generator (AWG)
* built in FFT analysis and display
* built in display for self contained use
* evolving software for USB PC attach and a 3rd party Android app
* support and evolving features and firmware upgrades
* decent run time on built-in Lithium poly battery

Room for improvement:
* the little buttons are very functional, and the menus take a bit of time to learn (as with any miniature DSO)
* the display could use the color and higher resolution displays now available

For many years I have lugged around a Tektronix \"mainframe\" TM515 with various modules in it. The thing weighs 65lb and for audio work and work on electric vehicles, provides very little more function than this little DSO! I now have a 5 lb kit including one (soon two) of these Xscopes DSOs, some small amplifiers, kit of probes, and a separate pocket sized digital multi-meter DMM. [more on Amazon review]