Oh you don't want to do that. Heat tape itself can have quite a bit of variation just like any other heating element such as a stovetop (sidebar, this is why higher-end pots & pans have copper bottoms, to help disperse heat evenly). Put the tubs into the rack, put down a piece of paper, and put a heavy book on the paper over the heat tape in each tub - the book will ensure there are no air gaps to mess with your readings. Let the rack run for a while and then measure the temps on top of the paper after you remove the book.Originally Posted by redshepherd
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