OK® Chemical Indicator Strips

Use in steam sterilization cycles between 250 °F(121 °C) and 273 °F (134 °C). Type 4 Chemical Indicator can be used to determine whether all critical parameters, time, temperature, and saturation of steam. Feature instantly recognizable 'OK' symbol after exposure to an effective steam sterilization cycle. K will turn from off white/white to dark brown/black color.