Thank you every one for your advice I think I'll just keep my cheapy one because its what I started with & if I step on & off of it like you said its the same but that digital duet I tried at Costco was 195.5 then I walked around the store some checked it again It was 192.5 so I tested it again it was 194.5 so Think your right about the presicion thing.My cheapy one I tried stepping on & off of it several xs this am & I do weigh myself In my nightgown every morning but its very thin & light every time I got on the scale this am it was at 198 so guess the cheapy ones arnt bad...THank you all I apprecieate all your replys.....