Reinforcing steels are required by standard to have a defined fatigue strength, which must be verified. These fatigue tests are most quickly and economically performed using resonance pulsators. Zwick’s Vibrophores (HFP) offer an optimum solution for this application up to 600 kN. Specimens can have a diameter up to 36 mm; from 14 mm they must be grouted – a grouting device is available.