The Fitbit Aria Scale tracks weight, body fat and BMI. It’s also pretty cool how it smiles at you too. As a gadget head, there’s really no way I could go through life without one of these. If you use a One, Ultra or Flex, this data gets synchronized to the same Fitbit account you use for other things as well. The scale can also be used by multiple people in a household, with each persons weight getting synchronized to their own account at Fitbit. The Aria comes with batteries. But don’t put them in before installing the app. To set the device up, first install the Fitbit Wi-Fi Scale…