Basic Data Loggers
Data Loggers record temperature readings at set intervals by electronic means. The stored data can then be downloaded to a computer. Data loggers may be used for audits and to establish the recording patterns of your vaccine refrigerator over time. They can be especially handy for determining whether a fridge that has exceeded 8 degrees Celsius has done so for less than the critical 15 minutes that may be permissible.
Daily minimum/maximum temperature readings will still need to be manually recorded. If you are using a data logger instead of a maximum/minimum thermometer, the data logger must have a visual max/min display so that you can record your daily max/min temperatures.