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The Haier HETL-01, with internal sensor, is an electronic 30-Day Temperature Recorder (30DTR), with factory-programmed alarms and visual display for monitoring storage conditions in vaccine refrigerators (+2°C to +8°C) over a 30-day period. The device shows the actual temperature, all alarm violations over the previous 30 days (on a rolling basis), the daily minimum and maximum temperature of the last 30 days, and the time duration of any violation.