signals of every well 21 are integrated in the time window the window shifts so to speak with the dispensing comb 32 over the mp 2 the kinetics of all of the wells 21 can be shown in a scaled manner one over the other in spite of the time offset the user receives the impression that the reagents are added simultaneously in all of the wells 21 of a tile 22 or of an mp 2 under observation the volume to be dispensed is likewise adjustable by software by corresponding control of a stepping motor in the pump or pumps 33 of the dispensing unit 3 an advantageous flexibility results from the fact that the dispensing comb 32 preferably has eight nozzles which are oriented linearly in the column direction of the mp 2 and which are an integral divisor of the quantity of the wells 21 of the mp 2 dispensing can be carried out in smaller areas of the mp 2 e g individual columns or possibly also only portions thereof for comparison measurements with different volumes of dispensing substance u2014 even null volumes no addition further individual columns can also be selected for dispensing by software which again increases flexibility and is not possible with currently available pipetting devices the volume that can be dispensed can also be varied in any way in that a determined quantity of identical added amounts shots are added by drops or shots per well 21 this has the advantage of a uniform mixing of liquids over the width of a well 21 particularly in case of highly viscous specimen liquids and or dispensing liquids further.