This series of microspheres has a slightly wider distribution than the monodisperse microsphere size standards. They are suitable for validating a range of instruments, including laser diffraction, electrolyte displacement and other particle sizing methods. The spheres have a density of 1.05g/cm3 and a refractive index of 1.59 @ 589nm wavelength. They are available in a range of sizes from 5 to 40µm, and supplied in bottles of 15ml.