Abstract: Based on high-precision force-sensitive sensors and STM32 microcontrollers，this study established a corresponding relationship between " the concentration，density，and buoyancy" of solutions．The changes in buoyancy were accurately measured by using force-sensitive sensors，and a liquid concentration measurement device was developed．After completing the design of the device，it was used to measure the concentration of sodium chloride，sodium carbonate，copper sulfate，and alcohol solutions，and the measurement results showed a deviation from the actual concentration of generally less than 0．3%，indicating a high measurement accuracy of the device．
