Which cooking device allows flexible temperature programming? A typical electric oven seems both an overkill and insufficient to make baked milk or a home made diary product like joghurt or matzoon.


overkill: too big, energy consumption, might be needed for many other things if blocked for ours
insufficient: rarely can be set to support say 25°C to sustain bacterial life, mine anyway not.


Do you have an idea how is a better suited, autoclave like, cooking device actually device called?! 

https://en.m.wikipedia.org/wiki/Baked_milk

P.S. for diary products only, I didn't know there are indeed autoclave-like kitchen joghurt makers, they mostly support fixed temperatures, but typically not beyond 45°C. For baked milk, you need 70°C.
You can easily (and very accurately) do this with an immersion circulator, such as Joule or Anova.  In fact, your application is an excellent one for what has become known as cooking "sous vide."