You don't need it at all. Some of us just like to have them because we tend to be picky perfectionists about the things we do. LOL
The 1588 is preset for 100 degrees. They are fairly accurite. 1 thermometer is enough otherwise you drive yourself insane.
The 1588 is preset for 100 degrees. They are fairly accurite. 1 thermometer is enough otherwise you drive yourself insane.