What are creative ways to maintain higher temperatures of developing solutions, for example, potassium oxalate? I want to maintain the temperature at about 110 deg F. (Or higher?) I'd like to have a device that's self-correcting with a sensor. Not just a heater. I tried a fish tank warmer, but that only goes to 90 degrees. I don't want to use a crock pot or coffee pot; these aren't self-correcting. It would be too hard to maintain a consistent temperature for repeatable results. The most creative idea I've heard from the Photo Formulary is using a waterbed warmer. These go to 100 deg, have a thermocouple sensor, etc. I'm checking to see if I can find one that goes to higher temperatures.