Saccharose solutions are a readily usable medium for the verification and calibration of refractometers measuring in the range of the ° Brix scale. The solutions are delivered as standard in 15ml plastic dropper bottles with the calibration certificate. However, larger volumes can also be provided. The calibration certificate gives the values for sucrose (in% weight / weight), ° Brix and the respective refractive index in tabular form. In addition, information on traceability and uncertainty is provided.