I found these a while back, and I bought a bunch at $2.49 each. I use one for my keg fridge, two on my mash tun, one on my HLT and one in each of my beer and wine cellars. They only show Celcius, and their range is -50C to +70C, so they're good up to the top of mash range. Free shipping from Hong Kong took about two weeks.
LCD Digital Thermometer for Refrigerator/Fridge/Freezer - $2.86 Shipped!
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