138Pro Digital Oscilloscope Kit with 2.4" LCD Display 200Khz Digital Mini Oscilloscope Portable 2.5Ms/s Sampling Rate, Built-in 1250mah Battery, Pocket Oscilloscopes with X1/X10 Probe

I bought this to adjust my subwoofer amp gains. Worked great. No distortion.

Bought it 4 times

Just needed to confirm some AC wave forms and this work just fine for my needs. I would buy it again.

everything was there and works as it should

After a couple of days of use, it stopped working. I was using it to set the gains on my car's audio system.

Although this scope is small I like how well it functions. It's supposed to be good to 200 Khz which makes it suitable for audio applications. I was able to run it up to 400 Khz without seeing any aliasing. That isn't true for the scope this will be replacing. Of course I wouldn't try to examine a complex wave shapes at those frequencies. I like that it comes with a real scope probe too. My previous one didn't.

This is my first oscilloscope so I can’t really compare it to othersIt’s small in size. Not really sure how a oscilloscope works or what it does but I will speak to my unboxing experience. All of it arrived safely. No issues or damage that I can tellSeems nice enough and is a good size I guess. Seems to have some cool features

I often need to probe a board that's got power going to it inside of something proprietary. A regular oscope is not really suitable for that purpose and it's a bit of a pain to get more than one measurement at a time without modifying the board itself. This oscilloscope, since it's portable, makes it very easy to look at waveforms in these use cases. I wouldn't replace my desktop oscilloscope with it, but until you really need one, these units really do come in handy.