I like this small inexpensive device. I put it on a windowsill first to see how it would do on a cold window for a few days. I then put it in my fridge to see if that changes. That works great! I plan to buy more. It's magnetic, so ideal for the fridge. It has 2 other installation methods. Fridge or freezer where I can see if it's outside of the recommended temperature range at all. It is very easy to use, just insert the battery and go!
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