3M Attest Incubator provides optimal incubation conditions for the accurate readout of 3M Attest biological indicators. Since the growth of each test organism is temperature dependent, it is critical that the appropriate Attest biological indicator be used with the correct Attest incubator. Biological indicator incubator, 14-vial (round), 56°C steam, 120 nominal voltage required, 90-132V acceptable.