This is versatile apparatus, on which all the specimen can be placed and visualized the different flow pattern at the same time. This apparatus consists of closely spaced transparent sheets. An inlet ink tank is incorporated which is supported on a floor standing metal frame. The height of tank can be adjusted. A system of pipes, valves and manifolds enables any combination of the sinks and sources to be used. A row of valves above the flow table is used to adjust the flow through each individual source.