The best thing to do is to put a known fixed weight on each scale and use the one that reads correct!
What to you mean by fixed weight....like a weight ball or something to that nature?
Yes! like a dumbbell. if you have the general type scale it works with springs and in time the springs lose it's tension.
Yes I think the both may have springs...and that you so much for the tip... :)
Set, Log, and Track Your Workouts
http://www.webmd.com/diet/food-fitness-planner/default.htm?ecd=wnl_fit_123011