Temperature Label are temperature monitors consisting of one or more small heat-sensitive indicators sealed under transparent, heat-resistant windows.
As implied by the name, reversible temperature labels can change back and forth as needed to provide an indication of the present temperature. One advantage of the reversible labels is that they can be used over and over again. Non-reversible temperature labels are a one time usage indication that the specified temperature has been reached. Non-reversible labels are useful in a situation where an operator is not available or does not have access to the label attached to a product under test. At any future time a non-reversible label may be examined to see if the specified temperature had been obtained.