The cooler uses fans to move the air across a Peltier device in the cooler wall, so a separate container inside for the mash is needed. I do 3 gallon or smaller batches and I currently use an 8qt SS pot to mash in. I just checked and my pot fits inside the cooler.
I think some testing with a reading every 30 minutes should be my next step. Maybe preheated so the test starts at 120* or so. A controller to limit the upper temp might be needed.
I guess I need to look into recipes which require a highly fermentable wort.
Anyone can drink beer, but it takes intelligence to enjoy beer. Stephen Beaumont