Abstract: The invention relates to a laboratory apparatus for handling at least one laboratory sample, in particular for mixing and/or adjusting the temperature of a biochemical laboratory sample, which is arranged in at least one sample vessel element, having a carrier device for carrying the at least one sample vessel element, an electrical control device, which is set up for controlling or setting at least one operating parameter of the laboratory apparatus that controls this handling, and at least one sensor device for recording at least one measured value, by which at least one geometrical property of the at least one sample vessel element can be determined, the at least one sensor device being signal-connected to the electrical control device, the electrical control device being set up for controlling the handling of the at least one laboratory sample in dependence on the at least one measured value and the at least one set operating parameter by at least one control step.