The SporeCheck Starter Kit contains a Dry Block Incubator with built-in vial crusher, 1 record notebook, and 1 box SporeCheck™ Biological Indicators, 25 count. In-office system for monitoring all types of steam sterilizers, including gravity, prevacuum, and flash sterilization. Results in 24 hour Test results are easy to interpret with a visible color change from purple to yellow if spores still exist, indicating sterilization failure.