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For what it may be worth, eInk shelf tags come in two temperature ranges. The normal temperature range is -15°C to 65°C (5°F to 140°F) while some of the Spectra displays (the black and 1 colour units) will work down to -25°C (-13°F). Commercial freezers run from around -23°C to -18°C (-10°F to 0°F) though most store freezers are nearer the high end of that range.
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