Few years ago I have [bought a scope meter UNI-T UT81B]. It is a good
device for the prices, it can do a lot of measurements for you. Main
limitation is a "single channel", and software provided by the Uni-Trend.
Finally I decided to use the [protocol specs] I got from Uni-Trend and
write a software for Linux because the provided software is for Windows
only and it not good at all (even thou it is now [version 3.0])