I use the Weight Watchers scale that also is supposed measure body fat, water %, bone mass and BMI. It's pretty accurate, but sometimes I have to "clear" the memory. So I grab some free weights and I put that on the scale first. I wait for it to register and take them off. Then when I get on it weighs me quite nicely.
Try putting something else on your scale to reset it and then get back on. Try to use something that you know weighs a certain amount so you can check the accuracy of your scale as well.
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