Integrated product design and engineering for a body fat scale. HMI design of an app for monitoring various personal body and health information. Development of all plastic parts for tooling and part production. The IoT-based ecosystem of this body fat scale includes the actual scale, whose housing concept was completely developed by us, and an app application. With the app application, the user is able to retrieve various body parameters. In addition, he is offered diet recommendations if his measured values deviate from previously set target parameters.