Conair Weight Watchers WW88WRC Instructions For Use Manual page 8

6. Now "BW" (body water) percentage displays for a few seconds.
7. Next, "BMI" (body mass index) will display for a few seconds.
8. Finally, "BM" (bone mass) percentage displays for a few seconds.
9. Scale scrolls through BF weight, BF%, BW%, BMI to Bone Mass again and then
scale turns off automatically.
NOTE:
If the scale is overloaded, "Err" will show. If you step on the scale
before "0.0" appears, the scale will not function properly.
Scale will show "Err" if there is improper foot contact in the
body analysis mode, for instance, when you stand on the
scale with socks or shoes on. Hard or dry skin can prevent
you from making proper contact with electrodes on the surface of the
scale. Try applying a small amount of moisturizer to your feet before using
the scale.
10. If body fat is >50% or <5%, display will show "Err".