I'm kind of psyched by the idea of making a dual purpose diy water bath for both film developing and sous vide cooking, Alton always said no unitaskers in the kitchen
@josheikenberry There's a good set of instructions here: https://www.iamthejeff.com/post/33/how-to-make-a-diy-temperature-controlled-water-bath-for-home-film-development
I think I'd use a larger container than he did, there are big plastic ones made for sous vide. The extra water volume would keep temp even more stable, and help keep a second, inner container heated if I wanted to use one to keep photo chem bottles from sitting directly in the same container that might be used for sous vide.