Owning an oscilloscope is a real gamechanger ... Of course, you also need a PC, although there is apparently third-party software for Android if you don’t want to lug a laptop around.
Here’s a USB oscilloscope project from a few years ... Quick, small, and useful; a schematic, board layout, firmware, and PC software sources are all available for download.
The company's Sampler-Extended Real-Time Oscilloscope (SXRTO ... The PicoScope 9404A-25 is equipped with PicoSample 4 PC software, allowing for easy instrument setup and waveform visualization.
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