Temperature indicator is a cost effective and disposable indicator that monitors temperatures during product storage and transportation, indicating whether the goods have been subjected to unacceptable and harsh conditions or not. Affixed directly to your products or their packaging, these indicators provide visual evidence of exposure to unacceptable levels of temperature allowing the customer to determine whether the product quality has been compromised or not. This temperature indicator is ideal for products with a known temperature curve and expiration characteristics. The duo temperature indicator indicates the duration of temperature at two different activation levels. If the window of the indicator says white, then there’s nothing to worry. But if the temperature climbs beyond the two given thresholds, then a red dye moves through the window indicating problem. When the temperature returns to normal, the dye stops moving. In this way the shippers can know how long the product was exposed to unwanted temperature. This duo indicator monitors for the length of time above 10 degree and for brief excursions above 34.