Standard Agar Media in 20 ml tubes, 50 tubes per box Time- and cost-saving Compliance with international standards and references Consistent quality The traditional culture media for microorganisms is agar media . The media are available in two formats. Agar media in tubes are for pouring agar plates. The content of one tube is sufficient for two 90 mm or three 60 mm petri dishes. Agar media in bottles are the cost-effective alternative for casting plates.