This is the only thing that shows ion trap power for my CRT that I could find.
https://frank.pocnet.net/sheets/168/1/12LP4.pdf
yours is most likely the same.
how this translates to the trap structure, who knows, is this magnet power measured at the top right at the magnet? or in the very center of the trap, ( most likely, or at the very end of it, near the spring/screws, all will have different power readings :/
does it even matter that much?