The project aims at providing proper and unified Quality Assurance to solar UV measurements conducted presently by spectroradiometers operating in Europe. The aim will be achieved through the development of a Transportable Unit, which after thorough testing and validation will be circulated to European UV stations where its measurements will be compared with collocated measurements by the local spectroradiometers. This project will provide an alternative method to test the quality of UV spectroradiometers that was done until now mainly at intercomparison campaigns. The unit will be also capable of offering to the local instruments spectral resolution and angular response characterisations. After the end of the project, the unit will be delivered to a qualified Institute (Joint Research Center) who will undertake its long term maintenance and operation, in order to provide continuous QA to Interested European UV stations.