M-40 Cryoguard Thermal Exposure Indicator

• Signal temperature: -40°C
• Activated indicator turns red when exposed to temperatures at or above -40°C
• Used for monitoring products shipped or stored in dry ice that need to be kept at or below -40°C
• Popular for monitoring frozen blood plasma, bone grafts, and many premixed adhesives
• Recommended for monitoring environments at or below -65°C
• Cryoguard indicators have a shelf life of eight months. The shelf life applies whether the indicator is activated or unactivated. An expiration date appears on the label on each indicator.