My old Lyman M5 scale has finally got to the point where I don't trust it anymore. When checking some charges today they varied by 4 tenths -2 to +2 I cleaned the agate bearings with carb cleaner and blow dried them, but no luck I guess after 40 years I need a new one. I have a couple of the electronic types but I like to check them against a balance beam type and also for making up just a few loads. Do any of the balance beams stand out or are they all about the same. Thanks Kenny