Pregnancy 
 
  The Aria Scale is safe for pregnant women to use. While weight data will be 
accurate, it will not likely be accurate for body fat % or BMI since there are 
dynamic psychological changes that occur during pregnancy. 
 
Environmental Conditions 
  The scale is designed to operate in typical household temperatures and 
humidity levels 
  It has been tested up to the following extremes: 
o  5 degrees Celsius and 75% humidity  
o  35 degrees Celsius and 45% humidity 
 
 
Lean mode 
 
For most people the scale’s regular method of calculating body fat will work 
properly. However, for exceptionally lean people (e.g., a competitive marathon 
runner with body fat < 10%) there is a special mode we advise. It’s “lean” mode and 
it can be selected during scale setup or in the device settings area: 
http://www.fitbit.com/settings/device/scale.