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The five temperature squares turn from gray/white to black when the temperature is reached
if it isn't
TL8-130 self-adhering 8 level indicators are available in packages of 16 labels each
The black temperature strip serves as a lasting record that the temperature was reached
This is typically referred to as PMT
5-Temp THERMOLABEL® 450-500°F 420°F The five temperature squares turn5 level Thermolabel temperature indicator labels are available in packages of 16 labels each. Our 450 500F product in the 5 Temp Thermolabel line features five incremental temperature sensitive elements that produce a non reversible color change to black at their rated temperatures. The test strip can be kept as a record of the temperature that was reached. Store in a cool, dry place. Product Specifications