A prototype purity measurement system that can process syrup, and A, B and C molasses (all of the factory high-brix liquid streams) was developed, providing a purity estimation for a stream in less than 4 minutes per sample. This system can operate independently with a minimum of supervision or maintenance. The system uses the previously published conductivity purity measurement system in an automated process. Trials of the system were undertaken at both Rocky Point and Millaquin Mills during the 2021 and 2022 crushing seasons. The results indicated that this system provides timely feedback to the operators to assist in the factory process control and fault finding, when used in conjunction with the analytical results from the laboratory.