That's is adorable Ruby!!! She sure is cooperativeHahaha that sound really funny!
I've got a babyscale (recommended by @Robin&BB) where you can put your cat on and it's big enough.
I don't know why your scale is giving different numbers?
Oh, Ruby ... that photo is a hoot!She is holding in her tummyhahahhaa
She ISN'T skinny
Look at this pic, and you will understand