The LiMCA (Liquid Metal CleanlinessLiquid metal cleanliness Analyzer) system, initially developed by Prof. Roderick Guthrie and Dr. Don Doutre at the McGill MetalsMetals ProcessingProcessing Centre (MMPC) in 1979, has undergone significant refinement and adaptation since its inception. This advancement has led to the creation of multiple variants tailored for various metalMetals systems, including aluminumAluminum, magnesium, copperCopper, iron, and steel. As a result, LiMCA has become the industryIndustry standard for real-time monitoring of non-metallic inclusionsInclusions in liquid metalsMetals, particularly within the aluminumAluminum sector. This paper provides a summary and critical assessment of the evolution of LiMCA technology, detailing key developments since its inception in the aluminumAluminum industryIndustry. In the final section, we discuss a modified design of the LiMCA system that has been used to measure the sizes, and size distributionsDistribution, of microbubbles present within a liquid metalMetals. Microbubbles are required to effect the removalRemoval of all sizes of inclusionsInclusions from a melt, including sub-50 micron inclusionsInclusions.