140mm Petri Dishes. 145mm x 20mm with lid. Triple Vent petri dish for better gas exchange. High quality petri dishes, manufactured from crystal polystyrene for optimal analysis by microscopy Our petri dishes have exceptional optical clarity and heat resistance. Temperature range for application -20°C to 60°C LM006 – 145mm Petri Dish, Vented. Supplied in packs of 120 Petri Dishes. Inner stacked sleeves of 15 dishes.