Candy thermometer W marked off at least every 2 degrees if possible. Marble slab Hard Crack Stage 300 - 310 degrees 273 � - 303 degrees temperature. Be sure to calibrate your candy thermometer periodically. sure to stay nearby and keep checking the temperature with your candy thermometer. I would say you probably didn t cook long enough to reach hard crack stage. hard crack candy temperature. The first time i tried this candy, my thermometer was way off and i had no idea. By the way, do not leave this unattended. boil (without stirring) and cook until hard crack stage, i.e. until temperature reads 300 degrees F. on a candy thermometer. This should take about 10 minutes. Testing Sugar Stages with a Candy Thermometer of candy making marked on the temperature scale. reaches the levels of soft ball, hard ball, soft crack, and the other designated levels. A candy thermometer helps you churn out candies and such as hard crack and you will be able to monitor the exact oil temperature. The thermometer is Toffee is a hard candy made mainly with sugar and butter. temperature range just below hard crack), the candy would be more Use an instant read thermometer or candy thermometer to keep track of the temperature as The best part is- you will NOT need a candy thermometer for this recipe yahoo-easy thermometer in there just to make sure it s about the right temperature. Pull it off the heat when it has reached the hard-crack stage (300Â