McKesson Datalogging Refrigerator / Freezer Thermometer with Alarm Fahrenheit / Celsius Ambient -40 to +125°C (-40°F to 257°F) / Sensor -40° to 50°C (-40°F to 122°F) Glycol Probe AC Adaptor / Battery Backup (1207262_EA) 1/EANIST ILAC MRA traceable; traceable certificate supplied Log 24 million readings on 2G micro SD card Retrieve data from logger with removable SD memory card or by USB cable to PC Logger records interior exterior minimum maximum temperatures into memory Battery life approximately 10 months in continuous operation with no alarm triggered Exceeds government (CDC VFC) vaccine monitoring guidelines