Question:

I saw I could measure temperature with Plug and Play Scada. Anything I should know about the details.

Answer:
Your constraints will probably be physical, since you need a convenient place to put the physical probe, e.g. maybe in the swimming pool filter? Also, with the freezer, it is probably a sealed unit, so you need to be innovative - maybe put it through the seal? - to get the probe in the correct physical place. Also, the cables on the probes that we use with the ICPcon cannot be cut, since they work with the change of conductivity in 2 different metals, and the amount of metal is critical for the measurement to be accurate, and this includes the material in the cable.