Response to ways to control temperature

I use a stainless steel tank for my developing and between agitations I put the tank in a waterfilled sink with the water temperature I want. The water covers about 2/3 to 4/5 of the height of the tank and the change in temperature (caused by a higher room temperature) for the entire developing session is only 0.1 to 0.2 centigrades. It doesn't work as well with plastic tanks since they are less efficient in transferring heat and also becuase they tend to float. The lid of the tank is tight so between every second agitation I leave the tank standing on the lid which has helped me get very even development (I use 120-film almost exclusively).

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