Easily find out whether your sterilization process has been contaminated. This in-office Biological Indicator (BI) system is ideal for monitoring liquid cycles as well as standard steam sterilization cycles. The system requires no crushing or activation and gives clear, easy to interpret results. A purple to yellow color change or visible turbidity of a processed ampule indicates sterilizer failure. Get final results after a 48 hour incubation period in any compatible dry block incubator operating at 55-60ºC. For users convenience, SPS Medical offers a calibrated 60ºC dry block incubator that comes with 15 wells and a lifetime warranty. Please note - this product requires refrigeration and must be shipping Second Day Air. Customer Service will contact you to make shipping arrangements based on the shipping zip code. Shipping fees will be charged as a separate transaction.