I use a cheap 20-dollar digital one. I don't know if it's completely accurate or not, but I don't think it matters much. I mean, it doesn't matter if I started at 155 and got down to 150 or if I started at 150 and got down to 145 - what matters is that I lost 5 pounds. So as long as your scale is consistent (whether it's totally accurate or not), it should be perfectly usable for you.
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