The 3M™ Attest™ Super Rapid Readout Steam Biological Indicator 1492V/1492VS, Brown Cap, 24 minute, monitors 270°F/132°C 3- or 4-minute and 275°F/135°C3-minute dynamic-air-removal saturated steam sterilization processes. This FDA-cleared and ISO-compliant biological indicator (BI) for steam sterilization provides a final fluorescent result, read by the 3M™ Attest™ Auto-reader 490 or 490M, after 24 minutes. Non-Latex Shelf Life: 638 Days