This document provides an introduction to zeta potential measurement using the SZ-100 instrument. It defines zeta potential as the charge on a particle at the shear plane. It describes how particle surfaces acquire charge through processes like ionization, differential ion loss, and specific ion adsorption. It explains that measuring zeta potential is a good way to evaluate electrostatic stabilization of suspensions and predict particle interactions. The document outlines how zeta potential is measured using light scattering to detect particle motion under an applied electric field, and how data analysis is performed to determine electrophoretic mobility and calculate zeta potential values.