Do you have any kitchen scales? If you can use them to weigh a few items (bags of flour, jugs full of water etc) you should be able to compare your kitchen scales and bathroom scales and establish how reliable or variable the scales are.
I had a set of scales which were susceptible to the slope of the floor and would give different results, varying by a couple of pounds, depending on orientation if there were any camber to the floor (which there is, in fact, in my bathroom).
Do you have any kitchen scales? If you can use them to weigh a few items (bags of flour, jugs full of water etc) you should be able to compare your kitchen scales and bathroom scales and establish how reliable or variable the scales are.
I had a set of scales which were susceptible to the slope of the floor and would give different results, varying by a couple of pounds, depending on orientation if there were any camber to the floor (which there is, in fact, in my bathroom).