Indicator for sterilization by autoclave with pressure 1 to 2 bar 120°C/135°C. No special stocking requirements. Safety and reliability. Made in Japan. Notice "Sterilisé" and three stars drawing change colour from pink to brown to show effectiveness of 121°C - 15 minutes or 134°C - 3 minutes and 30" sterilization and to black to show safety margin of 121°C - 20 minutes and 134°C - 5 minutes sterilization.