re: body fat scales - most are not that accurate. Their value lies in their being consistently inaccurate. So, they are good as a tracking tool, but you shouldn't necessarily take them too seriously.
That's the truth. I spent extra money buying one that measured body fat... and it said I was at 23%, which might be correct? Not sure. At my leanest, I was at 18%... and I have gained some fat... so I am sure it has gone up.

Then, I stepped on the scale another day... I had gained 1 pound... and it said I was at 25% body fat. Yea. Right.

I returned that scale and spent less money on one that just tells me how much I weigh.