Autoclavable Petri plates (tri-plates) are supplied by Micromaster. They have a size of 100mm X 15 mm diameter. These 3 compartments Petri Dishes are designed for easy, one-handed opening and closing. The flare and length of lid skirts allow lids to be removed and replaced easily and quickly while the extreme flatness of dishes provides obstruction free viewing. Injection molded from virgin biomedical grade polystyrene crystal, every lot of dishes is tested by an independent laboratory to verify the 100