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The Rainbow R6 is our latest in-situ fiber optic concentration monitoring system for dissolution testing, flux assays, solubility studies and other applications requiring high accuracy and repeatability in concentration measurement. The R6 is the core of Pion’s integrated microDISS and miniDISS dissolution monitoring systems, used for early phase compound screening and studies with biorelevant volumes, and FLUX systems, which improve the assessment of absorption potential. It is available as a standalone instrument for USP baths or specialized applications.