** For good fudge every time you should use a candy thermometer. At sea level the fudge should reach about 235 to set, if you are at a higher altitude it will be done at a lower temperature because water boils at a lower temperature as well. You are welcome to use a candy thermometer to check the timing of the recipe. If you want to be most accurate boil water and see what temperature your thermometer reads, it should boil at 212 at sea level. Subtract 1 degree on the fudge temperature for every degree lower that your water boils at.