WarmMark Duo

The ShockWatch WarmMark® Duo is a cost-effective, disposable temperature indicator that monitors temperatures during shipping and storage, indicating whether goods have been subjected to unacceptable conditions. These reliable temperature indicators provide visual evidence of exposure to unacceptable temperature levels, allowing you to determine if product quality has been compromised. It is ideal for products with a known temperature stability curve and expiration characteristics at certain time and temperature combinations.

WarmMark Duo Indicates the duration of temperature exposure at two different activation temperature levels. If the windows in the WarmMark Duo indicator stay white, there’s no problem. But if the temperature climbs beyond two specific thresholds, a red color moves through the windows of the indicator with the passage of time. If the temperature returns to below the threshold, the color stops moving. In this way, handlers and shippers can know how long the product was exposed above the threshold temperature.

  • Monitor for the length of time above 10°C and for brief excursions above 34°C
  • Know if a product has been exposed past a threshold and check for high temperature spikes.



Activation temperatures
10°C and 34°C / 50°F and 93°F

Response Time
Up to 3 days, 8 days, 14 days

0.75 in × 3.88 in × 0.06 in / 19 mm x 98.1 mm x 1.5 mm

Pressure sensitive

Storage Condition
Unused product must be stored in an environment with temperature
below the response temperature for optimal shelf life

Shelf Life
Two years from date of sale



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