3M 1262P Attest Steam Biological Indicator, Box of 25Biological indicator for 3M Attest Steam 27F 132C Vacuum Assisted or 25F 121C Gravity Sterilizers. Vials are easy to use and interpret with visual color readout in 48 hours. Self contained biological indicators significantly reduce possibility of contamination, minimizing false positives and assuring more accurate results. Accurate BI results with 48 hour visual color readout Color coded (brown cap) for quick reference and easy use Compliant with ISO