Temperature Sensors Connected To Camera?

Thanks in advance for your feedback. I am looking for suggestions on the following:

We would like to place a temp sensor in a cooler/freezer and have the sensor close a contact if the temp goes under or over a certian temp range ( -20C to 10C) or example. The sesnor will be wired/wireless to the camera I/O contact and we will manage the rest through the VMS.

Summary of requirments:

1- Wired/wireless Temprture sensor

2- Low power consumption

3- Can be placed inside a freezer/cooler (-20C to 20C operating temp)

4- Closes a contact when temprture goes above/below a set range.

5- Only hardware, No managment sotware needed

6- Low cost.

Thanks.

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