A laboratory stand comprises a holding rod for receiving instruments or measuring devices for treating or examining media or substances or mixtures which may be contained or filled into a vessel arranged next to the holding rod in the usage position, into which vessel appropriate instruments or measuring instruments can engage from above. In order to be able to perform the metering of the substances in the vessel prior to, or during, the processing in a simple manner and/or in order to be able to quickly and reliably identify weight changes, support projections are moveably mounted and provided with, or connected or provided with an operative connection to, a weighing apparatus such that the displacement of the set-up feet, which is increased in the case of increasing weight or reduced in the case of decreasing weight, can be determined as weight change.