... and repeatability. Specifications Size range:0.04μm~500μm Light source:Semiconductor laser (635nm, 3mw, 25000hrs) Test method: Liquid Concentration ... , rare metal, alloy, metallic oxide Non-metallic powders Talc, kaolin, calcium carbonate, coal, fluorescent, brucite, calcite, wollastonite, tourmaline, diamond, barite, fluorite, zeolite ...