These 50 × 9 mm Petri dishes are ideal for culturing micro-organisms on either agar or broth based media. Petri dish with absorbent pad Accomodates 47 mm diameter membrane filter Made of polystyrene with cellulose pad Temperature range: -80 °C to +80 °C Stackable Sterile (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)