3M™ ESPE™ Attest™ Biological Indicators for 270(deg)F/132(deg)C Gravity Displacement Steam Sterilizers, 1261P - This Biological Indicator is for use with steam at 270(deg)F/132(deg)C gravity sterilizers (25/box) - Self-contained biological indicators. - Design provides a maximum challenge to various steam sterilization cycles. A spore burden beyond the average bioburden (germ count) provides an extra margin of safety. Optimized media promote rapid growth of spores. Definitive color change of the media indicates sterilization process ineffectiveness. Quick verification time of 24 hours versus one-week, mail-in services.