SteriTestTM steam biological indicators for monitoring steam sterilization consist of a thermoplastic vial and a brown cap, a crushable glass ampoule with tryptic soy broth (TSB) modified with pH indicator, and a disc inoculated with Geobacillus stearothermophilus spores.

SteriTest™ Class 4 Sterilization Indicator Strips provide a distinct color change when exposed to sterilization cycle.