Here are a few inexpensive rods that I have tested over the years.
Note: A few of the listed weights in this chart may be off, as some / most are cheaper used / or older rods, where listed weights were not always easily obtainable. And some had dual ratings, in this case I just grabbed the rating off the blank that was closest to my result in testing.
I have a few more rods to test, that I have only lined up by feel, when picking up a new rod, I usually forget the number that is on the blank, and try to match it up to a line just by feel, only later do I test using measurements. I found that many of my hand test often coincide with what I would expect once known measurements get put in place for both the blank, and grain of the line. (But not always).