Xiaomi Mijia Body Composition Scale S400

The Xiaomi Mijia Body Composition Scale S400 is a smart bathroom scale that measures far more than weight. Step on it barefoot and it estimates up to 25 body composition metrics, then sends them to your phone so you follow a trend over weeks rather than one number each morning. Measurement is by 8-electrode dual-frequency bioelectrical impedance analysis, a step beyond the 4-electrode arrangement in ordinary scales, and readings cover weight, BMI, body fat percentage, muscle mass, water percentage, bone mass, visceral and liver fat and basal metabolic rate. The weighing range runs from 0.1kg to 150kg with 0.1kg precision, on a reinforced tempered glass platform with a hidden LED display that appears only in use. Bluetooth 5.0 links it to the Mi Fit, Xiaomi Health and Mi Home apps, where separate profiles keep each family member's history apart. It is rated for ages 6 to 80, runs on AAA batteries, and its flat 300 x 300 x 24.55mm body slides under a bed between uses. It suits a household that already tracks fitness on a phone and wants more than a weight figure — someone managing their weight, following a gym programme, or keeping an eye on the family's health over months. Readings stay consistent when taken at the same time each day, barefoot, on a hard floor rather than a rug, and with several profiles stored one scale serves the whole house without anybody's data mixing.