How to use the handheld body fat meter: 1. After installing the battery or pressing the POWER button, the LCD will display in full screen, and the buzzer will sound, entering the setting state; 2. Press the SET button to enter the height setting-weight setting-age setting-gender setting. This BMI scale uses the human body impedance physique and combines the corresponding body parameters (height, weight, age, gender) to measure body fat percentage. This formula is developed for different groups of people and has been tested. The result is very close to the method and can be used as a benchmark for measuring body fat.