Reliable Scales

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Hello! I am having issues with the scales I have. I get on them and get one weight. I get on them again and it might go up 2 pounds. Then I get on them again and it goes down 1 pound. It is very frustrating when I am trying to keep track of my progress. I am hoping others may share with me a good scale that I can buy that doesn't break the bank, but also is going to be reliable for my weekly weigh ins. Thanks so much for your help!!