STERIS Verify® Self-Contained Biological Indicators (SCBIs) are available as either single or dual species formats: Bacillus atrophaeus (BA) for ethylene oxide and/or Geobacillus stearothermophilus (GS) for saturated steam sterilisation. This flexibility allows the use of Verify SCBI in monitoring steam sterilisation [250°F (121°C) gravity, 270°F (132°C) pre-vacuum, 270°F (132°C) gravity flash] and ethylene oxide (EO) sterilisation processes. Each SCBI is completely self-contained in a vial with a disc inoculated with the specified spores, and an ampule of specially formulated soybean casein digest growth medium with a pH indicator. In addition, the vial label contains a chemical indicator for steam and EO.