If the WarmMark™ Time/Temperature Tag is exposed above its response temperature (18°C/0°F to 37°C/99°F) the chemical in the temperature indicator melts and begins to migrate down the track strip and color in the circular windows at a controlled rate. When the temperature falls below the response temperature, migration of the chemical in the detection device stops. Accuracy of the WarmMark™ Time/Temperature Tag is guaranteed to be within 1° above or below the response temperature.
These WarmMark™ Time/Temperature Tags are sold in cases of 100.