Help please! Yogurt making using heating pad?

[Guest guest]

I was planning on using the oven method (pilot light/60 watt bulb) but

alas my oven does not use a pilot light. I have had no luck getting

the temp anywhere near the 110 degrees required.

So...I found these wonderful instructions:

http://www.breakingtheviciouscycle.info/beginners_guide/yoghurt/heating_pad_yogh\

urt.htm

on using the heating pad method. This method is really all I can do

since I don't have a yogurt maker.

But my question is, how can you be sure that the temp of the yogurt

stays at 110-115 overnight? The instructions say to adjust the

heating pad setting (low/med/high) as need be based on the temperature

of the yogurt. This sounds pretty unscientific and I'm afraid I'm

going to have it too low or too high all night while I'm asleep.

Thanks for any input! -