The great technological evolution on the MEMS field, with the growth of their complexity into a smaller dimensions, comes alongside the development of more sophisticated and precise testing and calibration techniques to ensure the functionalities of these devices. Reliability of the MEMS devices is now-days essential in all the engineering fields, from automotive to aeronautical, space and medical one. SPEA is an Italian industry world leader in testing and calibration of MEMS devices. SPEA has developed an automatic machine, called Shaker, able to test and calibrate high-g MEMS accelerometers through three-axes simultaneous excitation tests characterized by the generation of sinusoidal acceleration stimuli at high amplitudes and high frequencies.