OK® Steam Sterilization Strips are indicators that monitor all critical sterilization parameters: steam, time, and temperature. In sterilization cycles OK strips guard against incomplete steam penetration, presence of non-condensing gases or excessive air, as well as from inadequate temperature or insufficient time exposure. The pre-printed standard reference color permits rapid and certain visualization of the results. If the sterilization conditions meet requirements, the arrow and the K will change to become at least as dark as the reference color O forming the OK expression. The color response pattern may be used for sterilizer diagnostic evaluation (interpretation chart is available on request). The indicator dot printed on the distal end of the 8 strip permits a secure sterile presentation. Only if this dot is dark may sterile personnel handle the strip and the package contents. Without such assurance contamination of personnel becomes a real risk. For steam sterilization cycles of 250°F(121°C)and 272°F (134°C).