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3M Attest 1291 Rapid Readout Biological Indicators for 132°C/270°F gravity displacement cycles have self-contained BI for gravity displacement cycles consisting of a Geobacillus stearothermophilus spore strip; sealed glass ampule with growth medium and dual indicator system; blue color-coded cap with holes for sterilant penetration and a filter as a bacterial barrier; and a chemical indicator on the label that changes from rose to brown when processed.