Includes body water percent (not tested). Includes "athlete" mode. Supports 2 user2 and Guest user. Display is lit. 0.2 pound resolution. Does not turn on automatically. Does not recognize user.


The Tanita BF-684W is part of the Scale test program at Consumer Reports. In our lab tests, Scale models like the BF-684W are rated on multiple criteria, such as those listed below.

Weight accuracy: How accurately the scale measures body weight.

Weight repeatability: How repeatably the scale reports the user's weight.

Body-fat accuracy: How accurately the scale measures body-fat percentage.


Calculates BMI Calculates BMI Calculates Body Mass Index (BMI) based on the user's entered profile.
Water % Water % Reports body-water percentage.
Muscle % Muscle % Reports body muscle-mass percentage.
Bone % Bone % Reports body bone-mass percentage.
Users Users The number of users the manufacturer claims the scale can be used by.
2 + Guest
WiFi WiFi Uses WiFi to connect to the internet to communicate readings.
Bluetooth Bluetooth Uses Bluetooth to connect to a smart device to communicate readings.
Auto recognition of user Auto recognition of user Units recognize the user based on weight.