These 50 9 mm Petri dishes are ideal for culturing micro-organisms on either agar or broth based media Petri dish with absorbent padAccomodates 47 mm diameter membrane filterMade of polystyrene with cellulose padTemperature range -80 C to 80 CStackableSterile (Gamma radiation sterilized)Designed to accommodate 47 mm diameter membrane filters these polystyrene dishes are stackable and feature squared-off edges on both the top and bottom to provide convenient grips for one-handed opening The snug fitting top ensures that neither the absorbent pad nor the agar media will dry out during incubation A frosted area on top of the lid permits labeling Packaging Dishes are packaged in heavy-wall polyethylene sleeves Caution Not for tissue culture application (Replaces PN 1471799)