Response to Economical water temperature control

I have the thermometer fixture described by Robert. However this is just a passive device, it doesn't control the temperature. I have a Moen pressure regulating valve in my shower which keeps the temperature fairly constant by regulating out any water pressure changes, once the hot and cold incoming lines have stabilized. I was wondering if anyone has tried this type of unit in the darkroom. They're not very expensive. I only need a loosely regulated wash temp of about 68 to 75 for prints.

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