> Do the stirring vanes really extend all the way to the inner wall of the vessel, over the entire height of the vessel? Yes. There is at least one little zone that does not get scraped at the bottom of the vessel but mounting a sensor through a double walled, oil filled heating chamber is going to be more work than the alternative. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .