The handhelds are nice! I used one when I had gym class in high school.
I'd say, that if your really really interested in watching your body fat percentage go down, then get one. I personally don't see the point because if I get on the scale and I weigh less then last week, then I lost some fat, but then again I am a girl and I'm just interested in losing weight not how much body fat I have...
On the other hand, for some people it gives them that extra sense of accomplishment/accuracy that they are losing fat, and not just water/muscle etc.
If you can get one for pretty cheap, then go for it...
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