A power pump performance analysis system includes a signal processor connected to pressure sensors for sensing pressures in the cylinder chambers and inlet and discharge piping of a single or multi-cylinder pump. The magnetic substance is of a magnetic composition comprising M, X and Y, where M is a metallic magnetic material consisting of Fe, Co, andor Ni, X being element or elements other than M and Y, and Y being F, N, andor O. When authentication of a user is successful, connecting information for an external device to connect to the information processing apparatus is written into the memory. In accordance with the invention, an individual may be subjected to such a method of testing andor training at a unitary center capable of presenting such tests to the individual, receiving input from the individual, and processing the received input. Methods using the valve are also disclosed.