Excursion-Trac Ultra-Low Datalogging Traceable Thermometer with NIST Traceable Certificate for Two Years,–90.00 to 105.00°C (–130.00 to 221.00°F) 1. Rolling memory structure, maintains most recent 525,600 temperature observations 2. Smart-Alarm™ features a visual/audible alarm that continues to alarm even if the unit returns to non-alarm conditions 3. Memory can be cleared on unit after downloading data to USB stick,Stores up to 10 unique alarm events .      4.Hassle-free retrieval of data – unit can remain in use while downloading and analyzing data      5.Status indicators – Low battery, memory full, USB data transfer and active alarm state