• Reliable proof that the product was maintained at the correct temperature • Used as a quick inspection tool that the product is in usable condition during the shipping and receiving process• Save time and money due to costly recalls• Self-adhesive design EXPRESS SHIPPING BY AIR IS REQUIRED TO PREVENT ACTIVATION WHILE IN TRANSITLabels are made up of a series of temperature-sensitive elements sealed between heat-resistant substrates with transparent windows. Each element changes color distinctly as its rated temperature is met or exceeded. The changes to the label are irreversible, providing a temperature history of the surface being monitored. The labels will not delaminate when removed, allowing them to be attached to an inspection report to serve as a permanent record. Ideal for use in the food, automotive, molding and metal working industries. Accuracy is 1.8F below 212F and 1F above 212F. Shelf life: 1 year after date of purchase.