Relates to a measuring apparatus (4) and corresponding methods carried out in e.g. hybridization systems for determining fluid parameters provided by a laboratory system (1). The measuring apparatus (4) comprises a measuring unit (5) and a processing unit (6) for determining the fluid parameters provided by the laboratory system (1) and the measuring unit (5) is accomplished to be able to be integrated into this laboratory system (1). The measuring apparatus (4) according to the invention is characterised in that the measuring unit (5) comprises a measuring block (15) without a reaction room (34) and at least one sensor (17). The measuring block (15) comprises hollow spaces (16) for receiving or guiding fluids (13) provided by the laboratory system (1). The at least one sensor (17) is arranged, for determining physical and/or chemical parameters of fluids (13) located in the hollow spaces (16), on or in fluidic operative connection with these hollow spaces (16) of the measuring block (15).