My yogurt maker. Bought it for $3 or $5 at a thrift store years ago. You have to use "starter" which is store bought plain yogurt. Heat a half gallon of milk in the microwave 20-25 minutes. Let it cool to ... I'm not sure of the reading, the thermometer that came with this doesn't show the temp but the range that's okay is only marked. When milk temp is right, add 5 spoonfuls of starter, stir and pour into the 5 cups.
Normally, I make it over night so we can have fresh yogurt for breakfast. Love it when it's still warm. Now I'm saving my own starter for the next batch. :)