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A comment on Caterpillar offers phone with built-in FLIR camera. Parent comment
https://en.wikipedia.org/wiki/Magic_mug
could be made with ink/paint changes that show (very approximately) the temperature (I think the ones around have only on/off states).
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https://en.wikipedia.org/wiki/Magic_mug
could be made with ink/paint changes that show (very approximately) the temperature (I think the ones around have only on/off states).