The BIA sensor will help you easily track your fat loss progress. What you need to know A new leak suggests the upcoming Galaxy Watch 4 will come equipped with a BIA sensor. A Bio-Electrical Impedance Analysis (BIA) sensor is used to assess a person's body composition. Samsung is expected to take the wraps off the Galaxy Watch 4 and Galaxy Watch Active 4 at its MWC event next week. Earlier this week, we got our first look at the design of Samsung's upcoming Galaxy Watch Active 4. Now, a new leak has revealed one of the key features of the Galaxy Watch 3 successor. According to reliable tipster Max Weinbach , the Galaxy Watch 4 will feature a BIA (Bio-Electrical Impedance Analysis) sensor to enable users to easily measure their body fat percentage in relation to the lean body mass. Since body composition is directly related to health, the Galaxy Watch 4's BIA sensor will allow you to better track your current state of health. While BIA sensors are common in smart