A mixing, stirring or dispersing apparatus (1) comprising a container (3) which has a mixing chamber (4), having a rod-shaped element (6) which projects into the mixing chamber (4) that transmits a force of a drive (7) to contents of the mixing chamber (4), and having the drive (7) located outside the mixing chamber (4), the rod-shaped element (6) is connected at an inlet into the mixing chamber (4) to a diaphragm (8) which is part of a wall (9) of the container (3), and the rod-shaped element (6) and the diaphragm (6) are movable by the drive (7), and a counting unit for detecting a number of revolutions of the drive (7) and a number of load changes of the diaphragm (8).