Temperature strip
Encyclopedia
Temperature strips are flexible, often disposable
Disposable
A disposable is a product designed for cheapness and short-term convenience rather than medium to long-term durability, with most products only intended for single use. The term is also sometimes used for products that may last several months to distinguish from similar products that last...

 visual indicators used to quickly and easily take and monitor surface temperature. They are used in laboratory, food and beverage, hospital and home applications, and often use a gradient color-scheme to communicate a safe or out-of-tolerance condition.
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