I have a Tanita scale & my own set of skin calipers. The Tanita scale is a complete piece of garbage for BF readings. My tanita scale says I am anywhere from 19%-23% BF. Skin calipers have me about 10%, which is about right.
A few months ago I was tested with calipers using every different formula & # of fold sites I could find. I ranged from 8.3-9.1%. The dumb scale still said around 20%. Not sure why it's off so much, but I don't even bother with it anymore.