Currently an Arduino uno has been used to gather temperature data from 2 "grove temperature sensors".

The maximum number of temperature sensors we can connect to our Arduino Uno is 6.
A code for a 6 sensor array has been made.

The sensors are said to be able to withstand -40*C, which is suitable for our freezer.

How this data is to be displayed or used as a safety measure is not yet decided, but the possibility is there.