We saw this Elitech RC-5+ Temperature Data Logger at Amazon for $19.95 USD. The specs looked great and for the price we just had to give a try. We were not disappointed.
The ElitechLog software is a free download and provides easy to view graphs and stats on the gathered data. Just to do 'something' with the unit we placed it in our refrigerator overnight in various locations. Below are the overnight averages:
Here is a temperature graph taken over a 20 hour time period and a data point every 60 seconds.
More equally useless projects come to mind and we will post the them below as they happen. In the end this is a great value and a useful tool.
After getting a new LG refrigerator we reran the experiment (NOV2023):