Temperature loggers are great. They are equipped with a microchip and a small battery and they will log the temperature of their surroundings every 1 minute. When the logger is retrieved, the data can simply be read out by a PC, by means of the USB connection. It is a cheap and smart solution to any risky shipment and it is a prerequisite if you ever want to make a claim on a damaged shipment due to overheating.
They can only be used once.
You can find a short manual here: https://www.tempsen.com/f/2020/03/25/RJ9pQ/TempSen_ITAG4_Quick_Guide.pdf