Deva Yoghurtmaker - Advice please

They all work on the same principle of gentle heat applied to a container (or small individual pots) of milk with a little starter yogurt in, you can't go wrong - take it gladly!

The deva is like a thermos flask but short and stubby with a handle. (In fact, I've been known to keep soup in mine if out for the day but that's beside the point :-D)

Generally white body with a blue lid.
No electric is required.
You simple heat the milk to around blood temp, (testing with the thermometer if your recipe gives you precise temp), add teaspoon live yogurt, wrap in a towel and leave overnight.
Stir in fruit, honey or whatever in the morning if you don't like plain yoghurt.

PS You can do the same with a regular thermos but the wide neck on this one makes it easier.

Hope this helps

Edited to add: Don't forget to keep a spoonful of each batch to make the next lot.