3M Attest Biological Indicator Incubator (116). 3M Attest Incubator that 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), 56C steam, 120 nominal voltage required, 90-132V acceptable. Priced per each. FREE Shipping!