Biological indicator vials are easy to use and interpret with visual colour readout in just 1 hour. Self-contained biological indicators significantly reduce possibility of contamination, minimizing false positives and assuring more accurate results. Designed for monitoring the steam sterilization process, 3M™ Attest™ Rapid Readout Biological Indicator for steam 270°F/132°C gravity displacement sterilization cycles provide a one hour readout.