Air temperatures can fluctuate much more rapidly than liquid temperatures, so while an air-based logger might show that your refrigerator temperature went into the “danger zone”, the actual liquid contents of the refrigerator may be perfectly fine.

This Glycol Buffer Probe accurately mimics the temperature fluctuations felt by refrigerated liquids. Fill it with Glycol (not supplied but readily available) and place it next to the liquid to be monitored for realistic temperature data.

This is HIGHLY RECOMMENDED for the storage and transport of vaccines and other temperature-sensitive medicines. It is compliant with US CDC requirements for vaccine storage monitoring.