> It is very difficult to get the oil to > stay still at a specific temp for any decent length of time. Temperature of a cooling fluid in a well insulated container will be far more predictable. You can even add enough heat and or remove enough insulation so that the temperature falls only very slowly. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist