We next applied HeinSight2.0 to monitor and control a cooling crystallization. This technique is by far the most applied means of driving supersaturation to isolate purified crystalline products. MSZW measurements on the actual process reactor are usually performed using PAT tools such as spectroscopic (FTIR, 31 Raman 32 ), or imaging (FBRM, 33 PVM 34 ). While these tools provide accurate in situ microscopic measurements of the solution and/or solid phase of crystallizations, they are often invasive, expensive, and specialized. Our non-invasive and cost-effective CV system has the potential to provide complementary macroscopic measurements by simply visually interrogating any reactor of interest, serving a broad range of applications.