Apparatus for testing liquid volume diameters and fluid flow meters

Apparatus for testing liquid volume diameters and fluid flow meters, comprising a weighing container, an inlet pipe, a baffle plate and a scale, wherein the inlet pipe is guided through the upper side of the weighing container, characterized in that the pressure difference between the medium in the interior of the weighing container (2) and the medium in the interior of the inlet tube (5, 7) is variable by adjusting means, wherein - is provided as the adjustment means at least one further feed pipe (14, 24) having a smaller diameter than the first inlet pipe (5), said inlet tubes (5, 14, 24) a valve (8, 40) for connecting and disconnecting and or - is attached as adjusting means at the end of at least one inlet pipe (5, 7, 14, 24) a diaphragm (49) whose opening area is variable, and / or - the realization of an adjusting of the distance (23) of the baffle plate (9) the end (11, 15) of the at least one inlet pipe (5, 7, 14, 24) is variable, or - is provided as a single adjustment, ...