In another thread, the question of temp control and measurement came up. I'm curious about approaches people have been using for controlling temperatures during emulsion making, and if anyone has tried to data log the temp readings so that one has a good record of the temperatures and times during the process. I guess I should start - I've got a Corning PC-420 stirring hotplate and the temp controller probe that you can get for it. I find the temp controller to be a bit tricky to figure out what it's doing sometimes, it's not as smart as one could wish for. But then it's just a hotplate, not a computer... So I find that I have to set the temp on the controller lower than what I want, and let it heat up to below what I want, and then make smaller adjustments to get the temp where I want it, otherwise, it will overshoot the temp I'm trying to get to. Once I figured out that approach, it does a pretty good job of holding the temp where I want. For data logging temps, I have not done anything fancy, just a pad of paper that I write what I do on it. I also record the time and temp if I think I need to or if it is changing. For time, I have a digital clock that I start at 12:00:00 when I begin the run and then all the times are easy to compare to each other and easy to record. I know there are some pretty inexpensive digital thermometers with data loggers that are sold for use in high schools and other amatuer projects, and it seems like it would be cool to get something like that. And for head control, is anyone using a heating mantle or heater tape to heat stuff up with?