The Propper Biological Test Pack and Cultural Service Program now gives the opportunity to monitor sterilization with a system that is # Fast: 48-hour lab turnaround time -Simple: place one test pack in your sterilizer every week (or more frequently if you desire) -Reliable: spore testing is one of the most dependable methods to monitor sterilization -Convenient: a complete system that is ready to use. Biological indicators in test packs, pre-addressed postage paid envelopes and report forms are provided for efficient sample handling. No additional equipment to buy. -Versatile: the test pack can monitor Steam, Dry Heat or Ethylene Oxide. -Documented: you will be provided with a permanent record of test results.