At the Technical University of Braunschweig (Germany) and the Delft University of Technology (The Netherlands) two True Biaxial Shear Testers were used to perform comparative measurements. The Braunschweig Biaxial Tester (BBT) and the Flexible Wall Biaxial Tester (FWBT) are part of a new generation of advanced powder testers whose goal is to fundamentally investigate powder flow based on the same principles. The general aim of these investigations is to compare the results obtained with both testers and gain new experience in handling powders.