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I have a compost tumbler and it doesn't seems to be getting that hot
I'll stick my hand in and it will feel somewhat warm (not sure if it's just from the sun or if it's actually generating the heat) but when I touch the material in there it doesn't feel hot at all. feels cold
and when I stick a thermometer it seems to read just 20'C but then again it was just a cheap eBay one so not sure did it's accurate