SpotCheck reversible temperature indicators (Liquid Crystal Monitor) provide quick and clear visual signal of the current temperature experienced by an object. As the temperature increases the large indicator circle will transition from blue to green to a brownish red. This color change is reversible, so the indicator circle will move backward through these same colors with a temperature decrease.

2-8°C (Blue below 2°C, Green between 2-8°C, and Red above 8°C)
This is a typical range for refrigerated products (e.g., pharmaceuticals that must be refrigerated but not frozen to maintain efficacy).