IRVINE, Calif. - Horiba Instruments, Inc., has entered into an exclusive distribution agreement for Dispersion Technology Inc.'s line of acoustic and electroacoustic particle size and zeta potential analyzers for the North and South American markets. The instruments join Horiba's range of light-scattering particle size and particle shape analyzers, broadening the range with zeta potential from 1 nm to 30 mm in concentrations from 1 ppm to above 50 weight-percent.