(20) Pack BRAND NEW Sealed MilliporeSigma 47mm Polystyrene Petri Dish
Material: Optical-grade molded polystyrene plastic.
Mixed Cellulose Ester MCE Membrane Filter Grid,Hydrophobic 0.45µm 47mm,6000pcs
(Material MCE (Mixed Cellulose Ester). 3) 3.1mm Intervals Grid Line: Gridded filters have clearly defined grid lines spaced at 3.1mm intervals. Contrasting grid lines facilitate counting colonies on the filter surface and are tested to assure freedom from grid line inhibition.