Using a roaster oven, build a cheese vat with a temperature that can be controlled digitally to 0.1 degrees C. The vat can also be used as a sous vide circulating bath. Part cost is around $100. No soldering is required.
Cheesemaker Yoav Perry writes:
When I began thinking about a sous vide machine that would not cost $400-$5000, I immediately began to understand the enormous potential it has to make a perfect cheese vat. At first, I did sous vide in the cheese vat and that’s where I met Lisa and Abe who inspired me to get a proper digital apparatus of controller and heater in there on the cheap and accurate. I then embarked on finding a form factor that can combine both uses: cheesemaking and sous vide.