Yeah leveling beam to level fretboards and frets. The radius is better at establishing the fretboard radius. I find they work well to radius the top of nuts too.
I have a 2001 535 that I love. I got it used in pristine condition a couple of years ago. It left the factory with a very not level fretboard. It was like a roller coaster. It was also only 9.5 radius too.
Some heroic effort had been applied in its prior life to level the fret tops. It played but had buzzes here and there. it just didn’t feel right either. Some frets were as tall as new wire, some were under .030 tall.
Tried everything I could think of. Then just decided to pull the frets out and do it right.
After leveling the board nicely and sanding it to a 10 inch radius refretting was a snap. Having a level substrate to set the frets in meant not much leveling work was necessary. Saved a lot of meat on the frets.
Moral of the story, have a good look at the fretboard. If it ain’t level, the frets won’t be either.