I don't have a way to monitor the heat, I use the sand bath and then just go by the dial on the roaster.
Thanks for the 1,2,3 method of cooking them. I'll try that this week. I usually sart at 200 and then go up 50 degrees every 2 hours and then let them soak around 400 for four hours and then let them cool until I can dig them out and they are not too hot to the touch, usually 12 to 24 hours.