FREEZEmarker ® is a single-use freeze indicator that provides an easy-to-read, irreversible visual signal when a freeze event at or below the response temperature occurs. It is adhesive-backed and can be applied directly to product surfaces or packaging.

The green circle and white checkmark are visible in the indication window at temperatures above the response temperature. When exposed to temperatures at or below the response temperature, the green circle and white checkmark will turn partially or completely white
(opaque/cloudy), showing that a temperature excursion has occurred and endpoint has been reached. If uncertain whether the end point has been reached, users can press the circle with their fingertips to evenly distribute the white particles.