Intercomparison of momentary values from observatories across Europe has been used as a test of reliability for the magnetic stations of this area, as well as for the whole net. One of the techniques used, based on the standard deviation of the mutual differences of monthly mean values, has permitted to obtain a measure of quality of the Ebre Observatory (EBR) magnetic elements for the period 1997-2001. The results nearly coincide with those obtained for the most significant observatories of the network, pointing out a good performance of EBR observatory.Peer reviewed