The WarmMark Duo is an affordable, disposable temperature-sensitive indicator designed to monitor temperature during transportation and storage. The packaging indicator effectively tracks the duration of time above 10°C and detects brief excursions above 34°C.

Monitoring Temperature During Transit and Storage

By displaying a warning and providing an observable duration of exposure through its indicator window, it alerts users to instances of unacceptably high temperatures. The temperature indicators offer visual confirmation of exposure to temperature levels that could compromise product quality. They are well-suited for products with specific temperature stability curves and expiration characteristics.

WarmMark Duo temperature indicator features two activation temperature levels, 10°C and 34°C, within a single indicator. Under normal conditions, the packaging indicator windows remain white, indicating no issues. However, if the temperature surpasses the specific thresholds, a red colour gradually moves through the windows over time.

Visual Warning for Unacceptable Temperatures

Once the temperature falls back below the threshold, the colour progression stops. This feature enables handlers and shippers to determine the duration the product was exposed to temperatures above the specified threshold.

The packaging sticker can be directly affixed to the products or the packaging to provide visible evidence of exposure to unacceptable temperature levels. This label also serves as a reminder for users to inspect the quality of the product and take appropriate action if necessary.


  • Dual threshold time/temperature indicator
  • Activate with the pull tab
  • Delivers irreversible evidence of exposure to unacceptable temperature conditions
  • Enables easy accept or eject decisions to be made by businesses
  • Assists in verifying the adequacy of cold chain packaging
  • Aids in compliance with regulatory guidelines
  • Require no special packaging or storage.
  • Available in pre-armed configurations for high-volume packaging environments



  • Pharmaceuticals
  • Diagnostics
  • Vaccines
  • Biologics
  • Test kits
  • Test Specimens
  • Chemicals
  • Paint

WarmMark Product Brochure: Download