The Refractive Index Qualification Test Solution is intended for use with refractive index (RI) detectors It is used to test the sensitivity, reproducibility, and linearity of the refractive index detector. This kit is designed for use by a Waters certified engineer or user as part of a performance maintenance or qualification activity. Protocols in the use of this kit are available via the purchase of Waters qualification services or self directed qualification training and license. The Refractive Index Qualification Test Solution kit contains, Caffine at various concentration ().1mg /ml, 0.2mg/ml, 0.5mg/ml, 1mg/ml & 10mg/ml