TIP: Calibrate your candy thermometer before starting to ensure the proper degrees are reached. It's easy to do! Bring water to a boil, and place the thermometer in the water at least 2 inches to read the temp. It should read 212 degrees. For every degree that it's off, you'll need to adjust the final temperature by that same amount. For example, if it reads only 210 in the boiling water, then instead of 234, you only need it to get to 229.