Aleksandrov, A.V. JACoW Geneva, Switzerland This talk discusses the performance of the devices for higher than two dimensional emittance measurements, allowing studies of coupling between all transverse phase space planes, and in a more advanced set up, coupling to the longitudinal plane as well. The results of the actual phase space distribution (and not only RMS values) are very important for modeling the beam dynamics for high current operation of LINACs. Furthermore an outlook of related methods for electron beams is given.