McFarland Standard Calibration Kit

McFarland Latex Standards are used as a reference standard to approximate the number of microbial cells in a liquid suspension. McFarland Standards consist of uniform polystyrene microparticles, which allow longer shelf life and comparable absorbance values to the original BaSO4 standards. These standards are prepared by suspending different concentrations of latex particles in a buffer solution that are adjusted to an acceptable transmission range using a spectrophotometer at a wavelength of 600nm.