This study aims to design a real-time system on STM32F4 to measure the density of liquid flow in construction building materials, which can be manually tested in laboratories or construction sites. The study provides an embedded system capable of sequentially and real-time measuring the velocity profile and pressure drop. Existing devices such as rheometers, which are expensive and require calibration, are used to measure fluid flows. However, this study presents a domestically developed device at a lower cost.