Check the listing for details. DeltaTrak 40527 Digital Temperature USB PDF Data Logger External Bottle Buffered. Condition: New. Listed at 49.95 USD. This reusable logger features a large, easy-to-read LCD and an external probe sealed in a 5ml liquid bottle. The liquid prevents false alarms by buffering the sensor against sudden and expected temperature fluctuations during regular use, such as frequent door openings and normal cycling of the compressor within the refrigerator or freezer. The liquid also emulates temperature changes experienced by most common fluids in storage, to give more accurate readings. -Includes Manufacturers Certificate of Compliance-Compatible with WHO and CDC guidelines-21 CFR Part 11 compliant software-Glycol buffered sensor emulates products and prevents false alarms-Automatically generates PDF, CSV and Daily Log reports-Audible and visual alarms-Low battery indicator on LCD-Quick disconnect cable to download logger-Easy to download reports and reset