COMBINATION FREEZE INDICATORS

摘要

A combination temperature exposure indicator (90) suitable for attachment to, or association with, a host product has a substrate, a freeze indicator (122) supported by the substrate and a cumulative ambient time-temperature indicator (124) also supported by the substrate The freeze indicator can provide a visual indication of exposure of the freeze indicator to a freezing or near- freezing temperature and the cumulative time-temperature indicator can provide a visual indication of exposure of the cumulative time- temperature indicator to a predetermined cumulative tune-temperature value Also disclosed are a combination freeze indicator and threshold temperature indicator, a combination threshold indicator and cumulative temperature indicator, and three-way combination indicators that can provide indications of cumulative past temperature exposure, exposure to freezing temperatures and exposure to a temperature above a threshold.