Connected scales, which go beyond measuring weight to provide insights into various health metrics, have gained popularity in recent years. The market for these devices reached 10 million euros in 2024, reflecting a 23% increase in sales volume compared to 2023. This growth is linked to the broader trend of digitalization and heightened health awareness, especially following the pandemic. These scales use a technology called impedance measurement, which involves passing a low-intensity electric current through the body via electrodes. The resistance encountered by the current helps estimate body composition, with more electrodes generally leading to more precise results. Most connected scales measure common indicators like weight, body mass index (BMI), muscle mass, fat mass (including both subcutaneous and visceral fat), water content, and bone mass. Some models also offer additional features such as basal metabolic rate (BMR), daily caloric needs, metabolic age, vascular age, pulse wave velocity, electrocardiogram (ECG), heart rate, cardio fitness index, and nervous system health. However, experts caution that the accuracy of these readings can vary, with public impedance meters potentially showing differences of up to 5 to 10 percentage points in fat mass measurements. Despite this, tracking changes over time might be more valuable than focusing on specific numbers. Connected scales are marketed to a wide range of users, including those aiming to lose weight, athletes, and individuals interested in monitoring their health. However, specialists warn that they may not be appropriate for certain groups, such as people with pacemakers, pregnant women, or those with other implanted medical devices. Some models include features that prevent the display of potentially discouraging results. Prices for these scales range from 50 euros to 400 euros, with models priced around 100 euros typically offering sufficient functionality for basic use. Connectivity options, such as Wi-Fi versus Bluetooth, can influence the user experience, with Wi-Fi often providing smoother data transmission. Experts recommend using connected scales once a week under consistent conditions, such as at the same time of day and in similar environments. They also emphasize the importance of combining scale use with a healthy lifestyle, including proper nutrition and regular physical activity. While these devices offer useful insights, they should not replace professional medical advice or comprehensive health assessments.