A process for treating samples of biological, microbiological and/or chemical material, comprising at least a step of arranging a plurality of samples of biological, microbiological and/or chemical material on a corresponding plurality of housing seats (4) of a transportable support body (3) of a support device (2), further comprising a step of projecting (3) onto the support body (3) at least a light signal (18), during the step of arranging the plurality of material samples, at the effective position or housing seat or seats (4) wherein each sample of material is arranged, such as to guide the positioning or to indicate the positioning visibly.
