Weight / Fat loss

Are those scales actually accurate though? I'd like to get one if they are legit. According to BMI I'm right on the edge of underweight, but I'm really short, and I have a much smaller frame that other people my height (as anyone who has seen the size of my wrists and hands will confirm), so although I may be trim I'm definitely not underweight.

My electronic scales put me at 25% bodyfat on the couch potato mode. I had a dexa scan which put me at 24%, so in that particular case it is fairly accurate. The athlete mode puts me at 12% though which is nonsense.