Thank you for the information. Don't forget the faraday!
Christmas Cookie Tins work well for small items. Use a THICK black plastic trashbag as an insulator on the inside. Make sure to have as much surface area of the bag in contact with the interior walls of the tin, and make sure you have a good seal on the metal lid of the tin to the body of the tin. It doesn't have to be air or water tight to work properly
an old disconnected microwave and a trash bag should work too.
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