ELISA floor-standing “Open System” processor with an 8 ways pipetting unit using standard low cost non conductive disposable tips, working at the same time on 9 micro-plates. An automated unit allows to manage the micro-plates on the working table. The instrument can use disposable tips of three different volumes (50ul, 200ul or 1ml), in order to optimize the dispensing accuracy and precision. Depending on the programmed volume, for each scheduled operation, the software will automatically select and use the corresponding tip type. The instrument is complete of bar-code reader for samples, 9 independent incubators-shakers with single programmable temperature and shaking.