When brewing a lager in an apartment, you will most probably use a small refrigerator for the lagering process. If the refrigerator does not allow you to choose the exact temperature, but instead you set it using a number of power levels (1,2,3 and so on), how do you achieve the small rising of the temperature for the diacetyl rest?
It should be fairly easy to determine the actual temperatures your fridge stays at.
Depending on the model your refrigerator may keep temperatures in a 2-5º band.
You can be more clever by affixing a larger wheel with an arrow to the dial. This will give you finer control over the thermostat. Write the temperatures along the outside of the dial.