A weighing apparatus, in particular a checkweigher or a price labeling system, having a frame which has at least one bar, in particular a rod having an at least partly round cross-section, and having at least one clamp connector, in particular a cross-clamp connector, for connecting the bar to a further bar in order to attach accessories to the frame, wherein the clamp connector has a first receiver for the bar and a second receiver for the further bar; wherein the first receiver has two clamp jaws which are rigidly connected to one another and between which a slot is formed, with the two clamp jaws being able to be tensioned toward one another, in particular by means of a tensioning screw, such that the bar can be clamped in the first receiver; wherein the bar has a recess, which reduces the cross-sectional surface of the bar, at an axial point at at least one of two, in particular at two, mutually oppositely disposed sides, in particular in each case, so that the bar has a reduced thickness (d) between the two sides at the axial point; wherein the opening width of the slot at least corresponds to the reduced thickness (d) of the bar and is smaller than the thickness of the bar between the two sides in a non-thickness-reduced normal region of the bar so that the clamp connector can be placed onto the bar from the radial direction at the axial point, but not in the normal region, while adopting an initial placement position, and the bar can thereby be received in the first receiver; and wherein, when the bar is received in the first receiver, the clamp connector is displaceable in the axial direction of the bar into a clamping position in the normal region of the bar, in which clamping position the first receiver of the clamp connector engages around the normal region of the bar by more than 180° in the peripheral direction. wherein the clamp connector has a first receiver for the bar and a second receiver for the further bar; wherein the first receiver has two clamp jaws which are rigidly connected to one another and between which a slot is formed, with the two clamp jaws being able to be tensioned toward one another, in particular by means of a tensioning screw, such that the bar can be clamped in the first receiver; wherein the bar has a recess, which reduces the cross-sectional surface of the bar, at an axial point at at least one of two, in particular at two, mutually oppositely disposed sides, in particular in each case, so that the bar has a reduced thickness (d) between the two sides at the axial point; wherein the opening width of the slot at least corresponds to the reduced thickness (d) of the bar and is smaller than the thickness of the bar between the two sides in a non-thickness-reduced normal region of the bar so that the clamp connector can be placed onto the bar from the radial direction at the axial point, but not in the normal region, while adopting an initial placement position, and the bar can thereby be received in the first receiver; and wherein, when the bar is received in the first receiver, the clamp connector is displaceable in the axial direction of the bar into a clamping position in the normal region of the bar, in which clamping position the first receiver of the clamp connector engages around the normal region of the bar by more than 180° in the peripheral direction.