I'm a wax sculptor and am interested in getting a temperature controlled soldering iron but I need a very low temperature range (like 100-250F). Most units come with a bottom end of 350F+. Is there a way to open up and modify one of these units easily or is it all pre-programmed in? I don't need the digital readout to report the correct temperature after any modifications but I do need the temperature control to be in-tact and working.
If it's not practical is there any way to modify a non-temperature controlled to be able to get such a range without resorting to programming some chip. I know I'd have to add in a thermocouple in or on the outside of the shaft but I wasn't sure if there are ready-to-go circuits or devices that will switch on/off the device to maintain a temperature based on a thermocouple unit.
(Actually, I have one of these right now but it's in the wrong temperature range and would be way too clunky as it's an external thermostat that does up to 108F for heating pads for plants, and I could i suppose weld the the probe of it onto the shaft of my soldering iron, if it did the right temperature range, but that'd be pretty inelegant).