Digital Scales

[Rallentando]

A month ago I bought a set of Weight Watchers digital bathroom scales. Since then I have found that they give a different weight every time I step on them even although I am wearing the same clothes. I can't take them back to Argos because, although I still have the receipt I have thrown away the packaging. I'd just like to know why scales record different weights successively and what I can do to prevent this. I wish now I had bought conventional ones.
Thanks to anyone who can help

[Naomicorlett]

Same time of day? my weight varies by 2lb from morning to evening. If not you don't need packaging just receipt. You can't be expected to keep all packaging " just in case ".

[Rollo]

Are you using the scales on a hard floor? If you have the scales on carpet you will get false readings.