it activates at a temperature threshold of 0°c.  with this new, lower temperature indicator, you&rsquoll know conclusively whether your products were exposed to freezing, potentially damaging, temperatures.  the actual conditions products experience, you gain the insights you need to ensure maximum shelf life for your products and to identify and correct issues before they escalate into expensive problems. many products must be maintained between 2° and 8°c, another wide range of products that must be refrigerated, cannot be allowed to freeze.  these singleuse indicators can be shipped even during the dead of winter without special packaging.    sourcehttpwww.shockwatch.comnewcoldmark2indicatorlowerstemperaturethresholdto0c