... Nano metallic powder, Nano ceramic material, protein, polymer latex, BT-90 dynamic light scattering nano laser particle size analyzer is ... on certified referencematerial). Warning:The power of laser diode of BT-9300ST is 3mw, normally, it cannot harm human body. ... fields of research, preparation and application of nano material.BT-90 features and advantagesHigh accuracy and repeatability: the error ...