Get a set of test weights and play with your scale before spending a lot of $$. See if 5 10 15 50 etc etc are spot on after leveling the scale to zero at zero. It may need nothing. Beam scales when they are on, are on. They cannot be made much better. The magnetic dampening is nice. If they are off, the problem will be, if I have it correct, that it will measure accurately though parts of their range. So low end or middle or top. If I had one like that, I'd get someone like Scott re-calibrate and figure out what was wrong......