Principle of fat scale: It is found that the "impedance" of fat part is higher than that of muscle and other tissues of human body when electric signals with a certain frequency pass through human body. When an electrical signal with a safe specific frequency passes through the human body, the electrical signal will change in different degrees due to the different "impedance" of the human body. Muscle contains more water such as blood, which can conduct electricity, but fat can't. Because the channel conductor of current in the body is muscle, the weight of muscle can be known from the difficulty of current passing, so it can be judged that people with less muscle have a higher proportion of fat. So in the process of measurement, you have to step barefoot on the metal on the table of the fat scale to measure. Use of fat scale: suggestion: 1. The measured data of body fat rate are for reference only. When you need to take measures because the fat content is too high or too low, please follow the doctor's advice. 2, the body has a pacemaker or other electronic components, prohibit the use of fat measurement function. 3. In order to keep the data accurate, please don't use this product in strong electromagnetic interference environment. I. Function introduction 1. This product can not only measure human body weight, but also measure human body fat content and water content. 2. Description of fat and moisture measurement parameters: fat and moisture measurement requires four parameters: weight, gender, age and height * * *, in which weight is automatically measured by this product, gender, age and height are set by manual keys, and can be memorized in the device.