These sterile petri dishes are used in conjunction with 47 mm diameter membrane filters to culture microorganisms. They have been designed for easy handling. Squared off edges provide a firm grip area for ease of opening the dish with one hand. A raised ridge on both the top and bottom of the dish allows dishes to be stacked and remain stacked. Snug fit prevents dehydration. Sterilized by irradiation. *Available with cellulose absorbent pads to allow technicians time to perform other activities. Absorption volume is 1.8-2.0 ml.