thumperchick wrote:So, anyone know how accurate the biometrics are with this thing?
No more or less accurate than any other leg-based BIA unit. Essentially, it measure how much a small current is impeded throughout the body. Fat is an insulator so current travels less efficiently, aka more impedance. On the other hand, muscle has a lot of water, so it conducts electricity, aka less impedance. By measuring how much a current is impeded traveling from one foot to the other, it attempts to calculate your fat percentage based on a database of norms for your age and gender.
In truth, these don't measure fat at all. More accurately, it estimates your water level and then calculate your fat and muscle from that (some will also guess at your bone density). Here are the problems:
1) Sending a current from one foot to the other only measures what's in the legs. The current does not travel through your upper body so it has no idea what's going on in the stomach, arms, etc. Professional BIA units send a current from one foot to a hand on the same side, to get an body-wide measurement. Furthermore, the patient has to lie at a specified angle.
2) Water in the bladder and intestines will affect the results, as may perspiration. It will lower the impedance, giving the illusion of less fat. This is why subjects should have an empty bladder, and be measure consistently each time. Please see my other post for more details.
That said, these are useful for charting trends when used properly. For example, if you're dieting, you should see a consistently lowering fat percentage. And a normal healthy person should see no longterm change. If a healthy person sees a number trending upward or downward without a change in lifestyle, then s/he should consult a doctor.
To answer your question, this is fine as long as you know its limitations. As a scale, it seem above average.