Polystyrene Petri dishes, with or without vents, excellent clarity, superior quality with a flat, stable bottom. A ''heavy'' version contains more material which gives even greater stability. 3 versions: aseptic, sterile E-Beam (electron bombardment) and sterilised by gamma irradiation.
Square polystyrene dishes specially designed for screening. They are ideal for agar diffusion analysis and all bacteriology applications which require a large surface area.