Two-component developers which consist of toners and carriers are widely used in modern electrostatic copying machines and laser printers which utilize electrophotographic printing process. Toner charge is essential in electrophotography. The toners are triboelectrically charged by the carriers when they come in to contact. Although there are several factors which come to effect in quality in electrophotography, control of adhesion of triboelectrically charged toner particles is crucial. As such the estimation of toner electrostatic properties is very important. ISJ (The Imaging Society Japan) has proposed the standard carriers with different charging abilities for estimating toner charging property as a standard method of measurement. The electrostatic surface potentials, when the films come in to contact with standard carriers are discussed. Further, Tungsten is used for film charging to understand the charging property. The contact is carried out as carriers and Tungsten beads are rolling on the film. It is confirmed that the standard carriers proposed by the committee of ISJ show same tendency in the film charging estimation as against standard toner. It is proposed that the standard carriers are useful to estimate the charging properties of various shape material.