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A new particle sizer which integrates the dispersion and detection parts is presented. Particles are dispersed based on charging between two parallel plates connected to a high voltage power source. The charged particles bounce between the two plates and escape into a measuring area where the size is determined by light scattering. The instrument is calibrated using standard powders. The data obtained from the new instrument are in good agreement with those obtained from a commercial particle size analyzer. The sizer works both for insulator and conductive powders.