Add an advanced thermal imager to your phone with this Seek Compact thermal imager. It connects to your OtterBox uniVERSE case for instant support, and you can find out the locations of any heat sources inside. Check your house for drafts and cold spots with this Seek Compact thermal imager.
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This gave me a good feel for what needed to be fixed in my home. I was able to tell where I was losing heat or where there were drafts that could not be felt.