STERIS Verify Process Challenge Devices are for use in monitoring steam or ethylene oxide (EO) sterilization processes. Each test pack is pre-assembled for convenience and ease of use, and utilizes the Verify Self Contained Biological Indicator. Verify Process Challenge Devices exhibit the same biological resistance pattern as properly assembled AAMI test packs, but with fewer steps and less chance of error. Chemical indicators in each device, as well as on each SCBI, provide immediate proof of processing. After incubation, a vivid color change in the growth medium from deep blue to bright yellow gives unmistakable evidence of microbial growth.