TBTPCR-300 portable concrete rheometer a portable instrument for measuring fundamental flow (rheological) properties of fresh concret, provides a scientific method to test the workability of concrete, which can be used in every step of concrete production and construction. It can be used in scientific research, concrete material ratio determination, production quality control and other fields. Users include scientific research personnel, experimental institutions, manufacturers, material suppliers and even construction personnel, which is suitable for use in the construction site.