AThe Ferroelectricity is a characteristic of certain materials that have continuous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferrimagnetism, in which a material exhibits a permanent magnetic moment. When most materials are polarized, the polarization induced, P, is almost exactly proportional to the applied external electric field E; so, the polarization is a linear function. PE Hysteresis tester is designed and developed   by our company and has recognition worldwide.