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Disinfecting PPE masks using dry heat and Arduino temperature controller
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ejeffrey:
If you want 2 degree accuracy, uniformity, and reproducibility you definitely need a fan.  A 12 volt PC case fan should work well and be widely available with standard mounting points.  I agree a lightbulb is the simplest, most economical, and most widely available heater for this type of application.

I wouldn't worry about Arduino availability but I would worry about it's ruggedness for how it sounds like you want to use this.  In a rushed situation you don't really want something where wires and sensors can be knocked loose or plugged in wrong or where the USB could be unplugged and it loose power.  If you are making a custom shield a lot of that can be eliminated, but then why not just put the microcontroller on the shield and eliminate the Arduino?  A small microcontroller with a temperature sensor a PC fan jack and a small SSR is a trivial design and none of those parts are in short supply.
ejeffrey:
Most of the cheap off the shelf temperature controllers in the 1/16 DIN format can probably do what you want as long as they user doesn't have to interact with their user interface.  If you can program them to run a preprogrammed cycle on powerup and light a "ready" led when the cycle is done that would be good. 
profdc9:
The Arduino Nano contains other parts already pre-assembled such as a regulator and USB connector and is easily programmable.  One can solder a Nano directly to a PCB if necessary or use pin header sockets which can secure the Nano into a circuit board.  I would propose the Arduino Uno as a second choice because a shield would be preferred as you note.  I imagine that this will be built on a solder perf board with point-to-point wiring in practice in most instances with a pin header socket if available.  I am using a mechanical relay rather than a solid state relay because these are more likely to be available I think.  Also, Arduino PCBs are probably available most anywhere where other devices for electronics assembly can be obtained.

I will look into the 1/16 DIN temperature controller.  The only disadvantage is that there are many models of these so it might be harder to recommend models or provide universal instructions.  Some of these appear to need some kind of external control to instruct the device to turn on and off.  For example:

https://assets.omega.com/manuals/M4636.pdf


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