Atom AT20 Steam Biological Indicator is specifically designed for monitoring the efficacy of
Steam sterilization processes. If the sterilization process has not been successful, the indicator
medium will turn to yellow or orange, thus indicating the presence of living Geobacillus
stearothermophilus (ATCC 7953) spores. If the sterilization process has been successful, the
indicator medium will remain the original color after incubation. The final readout should be
performed after 24 hours of incubation at 60±2°C.