Scales can give different readings when placed in slightly different locations; the floor may be uneven or it's sitting on a crack in the tile or over the grout and not on the tile, etc.
I have 2 scales; one is a relatively cheap black plastic WW scale I bought at Walmart. I had just been weighed at the doctor's office, so I weighed myself on the WW scale in Walmart, before I bought it. It weighed the same as the doctor's office. The other scale I've got is also a WW but it's fancier; it's glass and you can store info for 4 people on it. The two scales weigh me about the same. I use the nicer one-- the cheaper one is in the guest bathroom.
You could just keep the scale you've got. Set it down in one place, and leave it there. Not on carpet. Not on cracks or joins in the tile. You want a hard, level surface. If it consistently gives you the same weight when it's left in the same place (Step on and get a weight. Step off and let it reset. Step on again and see if it's the same weight.) I'd take the money you'd spend on a new scale, and buy a food scale instead. (Assuming you don't already have one.)
Ruth in Cookeville, TN Central Time Zone
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