The ConFirm strips contain both Bacillus stearothermophilus and Bacillus subtilis spores and therefore may be used to test all sterilization processes-steam, chemical vapor, dry heat and ethylene oxide. Mail-in sterilizer monitoring service provides: test results in 24 hours, the ability to check results online, a free reminder program, peace of mind and sterility assurance. Easy to use: 1) Sterilize, 2) Mail, 3) Get results, 4) Get proof. Economical, one of the most cost- effective methods of biological monitoring.