Ok, Here is an unboxing, set up, and testing of a neat, inexpensive, battery powered, hand held oscilloscope, claiming to have a bandwidth of 100 MHz! It seems to live up to most of the expectations,... as I thoroughly test this device. There is only one drawback, in that this device does not seem to be capable of saving the data in CSV format!? otherwise, it is a pretty good portable oscope, for the price!
https://amzn.to/3ZBcCjI
https://amzn.to/3Tabelz
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https://amzn.to/3yAZVJG